In the heat of battle, the Joker can fly into a frenzy, which change his abilities significantly. For the duration of the frenzy, his Fighting is Good, his Strength and Agility are both Remarkable, and his Intuition and Reason are both Feeble. During these periods, the Joker thinks only of murder and mayhem, often to the detriment of any plans that are in progress. The frenzy will last 1-10 turns after the conclusion of the fight.
Chemistry * Art
The Gotham City Criminal Underworld
Originally, the man who would eventually be known as the Joker was merely a non-descript lab worker, until the day he decided to steal $1,000,000 and then retire back into obscurity. To make certain he could never be identified by any of his facial features, the lab worker assumed the identity of the Red Hood, wearing a red cape and tuxedo and a metallic red mask that covered his entire head.
For weeks, the Red Hood looted Gotham City, successfully eluding capture by the police and The Batman. Finally, cornered by Batman and the cops while attempting to rob the Monarch Playing Card Company, the Red Hood tried to escape by leaping from a catwalk into the catch basin for all the waste chemicals from the plant, a basin that emptied out into the nearby Gotham River. Using the breathing apparatus in his mask, the Red Hood swam through the thick of the noxious chemical wastes to freedom.
When the Red Hood arrived home, however, he discovered that he had not emerged from the toxic chemicals unscathed. Apparently, the chemical vapors from the waste had somehow turned his skin chalk white, his lips ruby red, and his hair a vivid shade of green. The shock of this transformation was more than the Red Hood's already unstable mind could bear, and he went over the edge into utter insanity.
Convinced this was some sort of sign, the madman took on a new identity, inspired by the playing card company that had been responsible for his transformation, and became the Clown Prince of Crime, the Harlequin of Hate -- The Joker!
Originally a merciless killer who murdered his victims with a venom of his own devising that left their lips pulled back in a rictus, a perverse parody of his own malevolent grin, the Joker quickly became the arch-foe of the Caped Crusader known as The Batman, challenging the Darknight Detective repeatedly to life-and-death battles of wills.
Though the Joker appeared to mellow for a time, he has recently returned to his murderous ways, becoming once again the most dangerous madman on the face of the Earth.