(Challengers of the Unknown I #1) - Several raids were conducted on research labs, and the thieves made off with experimental technology. They targeted June's lab and kidnapped her as well, so the Challs got involved. They caught the criminals stealing a new transistor, but the Challs and the criminals were teleported to the lab of Olan Tagorian using his molecular ray. The fringe scientist was using the stolen parts to create an Infinity Machine that could open doors to other dimensions. He pierced the dimensional barrier, summoning a sonic creature and a burrowing creature. The monsters started destroying his lab, so he teleported them away, but the distraction allowed the Challs to get the jump on him and his men. The Challs tracked down the creatures; the sonic creature was absorbing electricity causing communication problems, so the Challs locked it in a sound-proof box, and the burrowing creature was eating the foundations of a town until the Challs shone bright light at it, blinding it. The Challs used the Infinity Machine to send the creatures back to their own dimension and brought Olan into custody.

(Challengers of the Unknown I #2) - Prospector Digger Bill called the Challs to Australia after he'd discovered a mineral being in a grotto that was growing rapidly and threatening nearby villages. The Challs planned to smoke it out of the grotto and hit it with dynamite, but June set the dynamite off early, covering the grotto entrance in rubble. She then caused their transport filled with weapons careening down a hill. The Challs didn't buy her claim that she'd been clumsy, and she revealed that she imput the parameters of their mission into her computer, which predicted the Challengers would fail and die. Since she couldn't dissuade them from a dangerous situation, she joined them. The creature burst from the grotto and was unfazed by explosions, so the Challs fled in a helicopter. The creature grew weaker, and Prof. surmised that it drew strength from sunlight, and during nightfall, which was approaching, it returned to the grotto to absorb heat. They'd lured the creature far enough away from the grotto, that it couldn't make it back and collapsed. June was proud of herself, by delaying the Challs mission she changed the parameters and defied the computer's conclusion.

(Challengers of the Unknown #5) - June was on an archaeological dig in Chandowa, India under Prof. Brandon. They discovered the Star-Stone, whose mystic powers worked by placing gems in the stone's niches. A fire opal sleeping from a sleeping volcano, an emerald a stone giant, and the Royal Bengal Diamond of Djiizari would all grant the user powers, and a pearl from the Bay of Sharks would make them permanent. Their assistant Vreedl stole the Star-Stone and retrieved an opal to gain fire-based powers, and used them to rob a railcar carrying money. June called in the Challs to pursue him, although they failed to keep him from stealing an emerald ring from a temple's stone idol. The Challs went to Djiizari and warned the rajah, who decided there'd be no safer place for the diamond than in his turban. The emerald gave Vreedl flying powers, and the locals mistook him for the legendary Birdman of Djiizari, gasping in awe as he made off with the rajah's diamond. The Challs pursued him, but the locals were upset that they attacked the Birdman and after restraining them, sent them to prison. June had staid back, distracted the guards with a supposed sighting of the Birdman, and freed her friends. Vreedl gained aquatic abilities and easily outmaneuvered the Challs while diving for the pearl in the Bay of Sharks. His now permanent powers included superhuman strength and invulnerability, and he easily handled the Challs. Ace told him he was the first person to best them, but planted doubts about his power by saying someone else would surely find the Sun-Stone and use it to gain the same powers as him. He destroyed the Star-Stone so no one else could use it, but it's destruction made him lose his powers, and the Challengers apprehended him.

(Challengers of the Unknown I #6) - June was forced to make an emergency landing when her plane ran into a storm, and she found herself on a very remote island. She explored a nearby cave, and rubbed a lamp, with the vapors giving her tremendous magic powers but sapping her will. The Challs went looking for her after they lost radio contact, and found a small village ruled by June, now dressed as a sorceress and controlled by American criminal Charles Agar. Agar was stranded on the island some time ago, and made a name for himself as a leader after impressing the villagers with a lighter and wristwatch. With June under his control he ruled the village, and had June assault the Challs with a river she summoned from a mountain. She turned Rocky and Red to stone, and after the effect wore off Charles locked them in jail. Prof. and Red saw that Charles needed June to keep inhaling the lamp's vapors to retain her power, and snatched the lamp from Agar before freeing their friends. They easily knocked out Agar as June recovered, but the villagers were upset and pursued them. The Challs didn't want to hurt them, but didn't have the time to explain they were allies, so they faked a spell by setting off some gunpowder. They flew home with June and threw the lamp into the ocean so no one could misuse it again.

(Challengers of the Unknown I #7) - The Challengers watched a TV report about a bank robber who used a machine to pass through vault walls, and decided to investigate. They let June come along as an observer, but told her to stand down if there was action. They caught the thief in the act, but he flew off in his plane, and the Challs followed, with une stowed away in storage because she didn't want to miss anything. The thief landed on a small deserted island, and when the Challs approached him he shrunk them with one of his devices and caged them. He explained that he was Anton Zammer, and had discovered the labs and inventions of deceased eccentric inventor Prof. Macon. He intended to use his disintegrator to finish off the Challs, but June rescued her friends and unshrunk them. Zammer opened Macon's final invention, but it turned out to be a failsafe that disabled his other inventions in case they fell into the wrong hands.

(Challengers of the Unknown I #8) - June's friend Maria inherited a castle in Mordania, and she discovered a scroll describing the treasures her alchemist ancestor had hidden in a secret vault in the castle. The Challengers were interested in investigating, and after uncovering the vault they opened one of the alchemist's boxes, only to be hit with a youth serum that turned Ace and Rocky into children. The villainous Drabny had been sneaking around the castle, and after following the Challs into the vault he stole the alchemists other creations, including glasses that let him see the distant future and a helmet that gave him control of mind over matter. After using the helmet to subdue the Challs he took control of Mordania, declaring himself a monarch. Prof. and Red tried to sneak up on him in his workshop, but he used his helmet to throw them in jail. June, Rocky and Ace posed as tourists to free their compatriots, and after the youth serum wore off they were all able to fight their way past Drabny's guards. The fallen Mordanian military confronted Drabny, who'd built a number of futuristic Star Cars, which he used to disable them. In the heat of battle the Challs exposed him to the youth serum, turning him into a child and causing his helmet to fall off. Drabny was deposed and sent to prison.

(Challengers of the Unknown I #9) - There was a rash of robberies, and before each one the victim was hit by a beam that erased their memory. The Challengers went to Marine Horizons, whose executive Mr. Higgins had just lost his memory, and learned that Horizons was planning an expedition to recover sunken treasure. The Challs went to the dive site and found scientist turned criminal Dekkar, who wiped out the Challs memory with his ray-machine before speeding off to his hq. June was in a separate boat, and tried to jog the Challs memory, reminding them of the fantastic skills each one possessed. She brought them to Dekkar's island, and when he used the ray-machine on them again their memories were restored. June had tinkered with the machine and put it in reverse, and the Challs apprehended the criminal.

(Challengers of the Unknown I #10) - June Robbins went to the jungle to study with Dr. Manning, who was working to understand the language of animals. She ran into an enormous Cave-Man Beast who'd been wounded with a gunshot, treated his injuries, and watched him wander off. The hunters that shot him berated her for letting him get away, saving the Beast had been spotted in town, and was clearly a danger. une found Manning's lab wrecked, and summoned the Challs. She pursued the Beast with Rocky and Ace, finding him at an airfield. Rocky and Ace attacked, but were easily repelled, but the Beast recognized June as the one who treated his wounds, and refused to harm her friends, wandering off. Prof. and Red flew over the jungle and employed a local tracker, but caught no sight of Manning. They had a collapsible cage to trap the Beast, which Red demonstrated on Rocky, making him want to punch his teammate. They found the Beast at the waterworks drinking, and when they tried to capture him he wrenched free a pipeline, blasting them with water. June wondered if Manning's notes could solve the mystery, and learned he'd developed a serum to use to talk to animals, and she deduced that it had turned him into the Cave-Man Beast. She convinced the Beast to drink the antidote, returning him to normal, and told him she'd already destroyed his notes because his project was too dangerous.

(Challengers of the Unknown I #11) - June was on an archaeological dig in the Caribbean with Prof. Markson, Spaatz and Cleary when they saw a glowing light atop a hill. Cleary and Markson walked into the light, disappearing, and two alien creatures emerged. June called the Challs, who engaged the aliens, only to be driven back by the beings eye-blasts. Rocky and Red decided to investigate the glowing light, and also disappeared, only to be replaced by two more creatures. Rocky and Red found themselves in another dimension, and were held captive by the alien Zarxes. They were imprisoned with Markson, Cleary, and an Aktonite scientist. The scientist said his people invented a dimensional exchange machine to explore Earth, but the Zarxes conquered them and took control of the machine, scouting Earth and intending to invade it. Rebel Srella helped them escape and brought the rest of the Challs to the world. The Zarxes needed full sunlight to function, so they blew up the artificial sun in the city that kept the invaders going. The Aktonites retook their dimensional machine, and after returning the Challs home promised to destroy the gateway.

(Challengers of the Unknown I #12) - The Challs made Challenger Mountain their new headquarters. June was studying with Dr. Fenton in Africa when he showed her giant footprints leading away from a wrecked lab, saying one of his monkeys got their hands on a growth serum and asking her to call the Challengers. The Challengers arrived to find June caged, Fenton had faked the runaway monkey scenario to get her to lure her friends to him. Fenton had been studying the works of an ancient alchemist and needed three items to gain power, demanding the Challs retrieve the items if they wanted June released unharmed. The Challengers retrieved a chest from a mountaintop and a bottle with a formula stored inside from a sunken galleon, but both items looked like they had been recently placed in their location. Rocky fought off a gorilla that guarded a idol that contained the final item, a gem in its forehead. The Challs returned to Fenton, and realized only the gem had power, the other two items were a misdirection so they wouldn't try to figure out how the gem worked. The gem split open to create a solar burst, and when Fenton tried to shoot Prof. he hit the gem half instead, destroying it and making the artifact useless.

(Challengers of the Unknown I #13) - Archaeologist Dr. Henry presented the Challengers of the Unknown with evidence of the historicity of the Golden Fleece and Jason and the Argonauts, uncovered in a book from the archives of Rhodes. The Challs traveled with him to the island of Colchis, and soon Rocky discovered the fleece and put it on, finding himself filled with strange and uncontrollable powers. When his teammates approached him the fleece summoned a fire breathing dragon to hold them off while he fled. June and Henry found a vase purporting to hold a liquid that could take away the uncontrollable powers of the Golden Fleece. The Challs caught upto Rocky who summoned a Cyclops, which Ace took out by hurling a hornet's nest at his eye, and a centaur that Prof. roped. June dressed as a mermaid, luring Rocky towards her, and when he was close enough she tossed the vase's liquid at him, breaking the Golden Fleece's spell.

(Challengers of the Unknown I #14) - The Challs were at Challenger Mountain when they were hit by a beam of light from the sky that teleported them to another planet. They found themselves in an alien lab, with two enormous K'zana beasts present. The K'zanas shoved June, Prof. and Red into a cage while Rocky and Ace made a mad dash to escape. One K'zanas pursued them, but was soon distracted by an alien bird flying from a bush and pursued it instead. Ace and Rocky met aliens who revealed that the lab was theirs, and they'd captured one of the rare mountain beast K'zana they were there to study, only to have the two the Challs met show up looking for their friend, and they were forced to flee. The K'zana couldn't actually work any of the lab's tech on purpose, so the aliens reasoned that the K'zanas had accidentally tripped the teleportation ray. While the K'zana remaining in the lab tossed around equipment one piece landed near the cage, and Prof. used it to freeze the bars, smash the cage and escape. They found the imprisoned K'zanas, and June fed him because he was clearly hungry. The other K'zana arrived, and June freed her new friend, who fought to protect June, wrecking parts of the lab. All the K'zanas got bored and wandered back to the hills. The other aliens decided to build a force field to keep the beasts from their research station, and returned the Challs to Earth.

(Challengers of the Unknown I #15) - June was doing experiments with microbes taken from a balloon that went 75 miles up into the atmosphere, exposing them to lower level atmospheric elements. Due to a million in one freak chance the chemical reaction caused an explosion that turned June into a giant. The sudden change made her woozy, and soon after her teammates returned to Challenger Mountain she passed out. One of the atmospheric microbes grew to monstrous size, and the Challs had to flee from it, finding it would not cross a river at the base of the mountain. June recovered and saw the giant microbe attacking a nearby village. She sprung into action and the two giants clashed but June started to get overpowered. The Challs commandeered a firetruck, spraying the microbe with water, paralyzing it with pain, because as a creature of the upper atmosphere it was weak against water. The chemical reaction June created finally wore off, with June and the microbe both returning to their proper size, and the Challengers got busy cleaning up the lab.

(Challengers of the Unknown I #16) - June's plane crashed in the desert, and the Challs split up to search for her. Red and Rocky spotted her, dazed and fatigued from lack of water. As they went to her a medieval castle appeared in the desert, solidifying from a mirage. In this Mirage World the knight Sir Manson proclaimed June as his damsel, and had his fellow knights throw Red and Rocky into a dungeon. Melissa, a woman sympathetic to the outsiders, freed the Challs, telling them the Mirage World only appeared on Earth once a day every hundred years. The time gate that connected the two worlds would close at day's end, so the Challs had to save June fast. Manson solidified his claim on June by winning a jousting tournament, despite June telling him she wanted her freedom. Red and Rocky rescued her and fled towards the time gate, where Prof. and Ace had just arrived, but they were then all surrounded and trapped by knights. The Challs challenged Sir Manson for June's freedom, and by the laws of the Mirage World he was obliged to agree. Manson and the Challs battled using chariots, but as the time gate was closing Manson grabbed June and made his way towards it, interested in going to another world. Melissa and Manson's fellow knights helped stopped him, allowing June and her teammates to escape in the nick of time.

(Challengers of the Unknown I #17) - Ace took June on a shopping spree when a genie robbed a bank, stealing only pennies, destroying its' storefront. The Genie smacked Ace and hopped in a getaway car. Ace recognized the red clay from the tire tracks as coming from Fairview County, and the Challengers went into action. Malvolio, a stage magician turned criminal, was mixing a potion to restore the genie's full powers, and used the pennies the genie stole as the first component. Malvolio sicced the genie on them, but when June confronted him he was scared off. The Challs found a foundry where the genie was devouring brass to gain power, but June caused him to fly off. The final ingrediant was iron ore, and June said she'd better lead the assault. The Challs realized June was wearing a ring of opal, often used to combat black magic in ancient times. They busted Malvolio, and smashed the horn that housed the genie so he couldn't return.

(Challengers of the Unknown I #18) - June inherited a tropical island in the Caribbean from her late uncle, and the Challs thought it would make a great vacation spot despite the fact that it had been dubbed Mystery Island because of recent unexplained events that kept people away. The Challs saw a satellite crash into the ocean from space, and retrieved it. Inside they found a small space creature, and surmised that the satellite was an experimental space capsule launched by other alien beings. They offered the fatigued creature water, which he eagerly guzzled. The alien warmed to June immediately, and the Challs named him Cosmo. They arrived on Mystery Island, splitting up and discovering that a number of threats appearing to keep people away from the island, including a live volcano, ghostly apparitions, falling trees, and windstorms were all man-made. The Challs fell into traps, but Cosmo rescued June, Ace and Rocky by chewing through the steel net they were snagged in, and blasted a path through the forest using his eye-beams to find their other teammates. Red and Prof. were prisoners in an oubliette in a cave, but were freed by their teammates. The cave was filled with guns, grenades and burglar tools, and suddenly a group of gangsters appeared, drawing their guns. They were running an underworld depot, and had previously kept people away with the dangers they'd created around the island. Cosmo blasted the guns from their hands and the Challs beat them down. The authorities were called in, and told the Challs they could keep Cosmo in their custody as thanks for busting up the gang, and the Challs thanked their new pet for saving their hides.

(Challengers of the Unknown I #19) - The Challs were assisting June on an archaeological dig in the Middle East when petty crook Hank Roney stole a giant gem from the nearby Shrine of Oshtar, scoffing at the idea that the gem wa cursed. When sunlight hit the gem a giant four-armed monster was released from the gem. Roney fled, and the monster attacked June's dig site. The Challs lured it under a natural stone tunnel and et off dynamite, imprisoning it. The monster started to dig free, and the Challs consulted the local wise man, who told them about the theft of the temple and the legend of the gem. In times past an evil sorcerer created the gem, which contained two beasts, and terrorized the land until a good wizard vanquished him. Roney, while trying to get rid of the gem, accidentally freed the other beast, a winged serpent, and after fleeing from it for a bit finally figured out that the gem let him control it. The four-armed monster freed itelf, and Roney led hi beast to the nearby village, warning the Challs to stay out of hi way or he'd destroy them. Ronet forced the villager to load up the treasure of the Shrine of Oshtar for him, threatening them with destruction. June, disguised as a fortune teller, distracted Roney long enough for Ace to wrest the gem, and control of the monsters, away from him. Ace returned the monster to the gem, and then, on the advice of the wise man, destroyed it so it could never fall into the wrong hands again.

(Challengers of the Unknown I #20) - The Challs called an emergency meeting after Multi-Man escaped prison, using his super intelligence to construct a weapon from simple item and melt the bars of his cell. Multi-Man and hi newly assembled gang robbed Blair Rocket Plant, and Multi-Man took an experimental rocket pack. Ace and Rocky arrived on the scene firt, but Multi-Man used knockout gas on them, and had hi gang take them back to their hideout. The other Challs found a note at the crime scene indicating that Multi-Man' next target was the Electro-Dyne Factory, and hurried over to catch him. Rocky and Ace sent out an S.O.S. using lights and a mirror, and the police arrested Multi-Man' gang. Multi-Man took an experimental energy ray from Electro-Dyne, and finished perfecting it, but when the Challs arrived he was forced to flee. Rocky and Ace had found Multi-Man' plans at hi hq, he intended to replicate all his old powers using technology. He next stole an oxygen extractor that allowed him to breathe underwater from Norse Nautical Instruments, and his last target was Astro-Metal Products, where he turned their experimental lightweight steel into impervious metal with his energy gun. The Challs used an electric magnet from the plant to pull the metal away from him, and apprehended him before he could grab his energy ray.

(Challengers of the Unknown I #20) - The Challs monitored the orbital flight of astronaut Captain Carlson, and after hi rocket malfunctioned June plotted his descent, finding that he'd land in the wet coat of Africa. The Challs arrived in Africa only to find the rocket, but no sign of Carlson, so they split up to look for him. Rocky and Ace flew their helicopter to get an aerial view, but were attacked by a winged lion, while their teammates drove their truck through the jungle and chased off a rampaging giant baboon that was attacking a nearby village with a fire hose. The Challs met up on a nearby beach, where Carlson lay prone, and seeing hi spacesuit wa glowing they figured out that he'd picked up a cosmic contamination in space that was mutating any living thing that got near him. A whale grew legs and walked onto shore towards the astronaut, so Ace and Rocky went to save him. The contamination turned Rocky into a giant and gave Ace the power of flight. They used their newfound powers to fend off the regrouped animals while June set up a field lab and sprayed Carlson down with steam. With the contamination gone the animals and Challs returned to normal.

(Challengers of the Unknown I #21) - The Challs received a coded message from June, and flew to a remote forest, where beams of light struck them and left them unconscious. When they awoke they seemed to be on an alien world, and were approached by an alien princess asking them to save her from Agnoks. The Challs put up a fight until Ace recognized the princess' perfume as June's, and tugged off the mask of one of the alien attackers. Director Albert D. Farnum was making a movie about the Challs, and convinced June to lure them there, he wanted genuine Challengers action with no acting. The alien landscape was filled with experimental inventions, and some crooks hijacked giant mechanical birds, attacking the Challs. The crooks thought the inventions would be great for pulling heists, and further challenged the Challengers with a giant robot and a giant top. The Challs came out on top, and Farnum filmed it aall, thrilled with the action.

(Challengers of the Unknown I #21) - The Challengers tested the abilities of their space-pet Cosmo when they had to investigate havoc caused by the telekinetic villain Zardoc. They saved hikers from a landslide caused by Zardoc, but the villain almost killed Rocky and Ace when he levitated the bridge they were on and spun it into the sky. Cosmo sensed their distress, and created a forcefield to cushion their fall. Cosmo nearly defeated Zardoc before he conjured a dragon from his thoughts to fight the pet. The Challs distracted Zardoc, causing the dragon to disappear, and Zardoc fled. The next time they met the Challs distracted Zardoc with a reflection of Cosmo, allowing them to remove his helmet, the source of his power.

(Challengers of the Unknown I #22) - The Challs went into town to pick yp supplies for Challenger Mountain when they witnessed a group of warriors from all ages, including a knight, a caveman and a Roman gladiator, attacking the townsfolk. The Challengers subdued them, bringing them back to Challenger Mountain. A gigantic alien named Monstrus burst into the mountain, capturing the Challs in its' tendrils. The creature's owner was the alien J'kal, who explained that he was collecting warriors and adventurers from all time periods for his intergalactic zoo. He thanked the Challs for rounding up his subjects, whose electric cells had lost power, but told the Challs he was adding them to his zoo. The Challs found themselves imprisoned, but Ace short circuited their cage by jamming the nails froim June's heels into the cell's electric lock. They woke Monstrus, who was guarding them, but Prof. and June escaped in their pickup truck while the other Challs distracted Monstrus with grenades. An alien law enforcement agent from J'kal's planet used a freeze ray to disable Monstrus, and demanded that J'kal surrender peacefully. J'kal pulled a gun, but June and the Prof. returned in a plane and strafed the ground in front of him, disarming the alien. The alien officer arrested J'kal, and used the technological marvel the starkan to send J'kal and Monstrus back to their homeworld, and then returned the warriors of ancient times back to their time periods in the past.

(Challengers of the Unknown I #23) - The Challs investigated when food disappeared from a lunch party and a model home disappeared from an exhibition following the appearance of a swift moving cloud. June, Red and Ace flew into the cloud while Ace and Rocky met some aliens that appeared in town and helped them fend off a mechanical monster. The aliens, Dr. Kue and Greeg, explained that they were scientists that invented a floating city meant to explore other worlds, but the criminal Zog and his gang took over the island, and, under the cloud cover shielding the island, were using its' tractor beams to take samples of Earth objects so they could study humans before taking over the planet. Kue and Greeg escaped Zog, who'd sent the mechanical monster after them, and they assured the Challs that if their friends had investigated the island they'd been captured by Zog. Kue and Greeg flew a plane near the floating island to trick Zog into capturing them. Rocky and Ace were hidden in the fuselage, and after freeing their friends created a distraction, allowing their allies to reach the island's automatic defense panel. Zoog and his gang were shot up into the air by air bursts, and then dropped into a holding cell. Kue and Greeg thanked the Challs for their help, and left with Zog to their home planet where the criminals would face justice.

June's appearance in Showcase #7 was reprinted in Challengers of the Unknown II #75. Her appearances in Challengers of the Unknown I #2 was reprinted in Challengers of the Unknown I #76, Challengers of the Unknown I #6, 7 reprinted in Challengers of the Unknown I #78.

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