Here I am going to explain a little about the groups in the Dragonball universe. You will find information on the group's history, it's members and a pic of each member.
Names: Z Warriors, Z Soldiers, Earth's Special Forces
Members - Saiyan Saga: Son Goku, Son Gohan, Piccolo, Kuririn, Yamcha, Tenshinhan, Chouzu, Yajirobe
Members - Freeza Saga: Son Goku, Piccolo, Son Gohan, Kuririn
Members - Android Saga: Son Goku, Son Gohan, Vegeta, Piccolo, Kuririn, Yamcha, Tenshinhan, Mirai no Trunks
Members - Cell Saga: Son Goku, Son Gohan, Vegeta, Piccolo, Kuririn, Mirai no Trunks
Members - Buu Saga: Son Goku, Son Gohan, Son Goten, Vegeta, Chibi Trunks, Piccolo, Kuririn
History: The Z Senshi was first formed properly when all the Earth's greatest fighters came together to defend the Earth from Nappa and Vegeta. With four members dead and one hospitalized, Son Gohan and Kuririn were the remaining members, but with the revival of the others the team was back to full force. When the Andriod Saga came it seemed that Chouzu had left the team and by the Cell Saga Yamcha and Tenshinhan followed. But with the addition of Vegeta, Trunks and Son Goten, the team did not suffer.
Names: Freeza Force
Members - Saiyan Saga: Radditz, Vegeta, Nappa
Members - Freeza Saga: Freeza, Zarbon, Dodoria, Kiwi, Ginyu Tokensenkai and many other lesser fighters
Members - Android Saga: Cyborg Freeza, King Cold and a few lesser fighters
Members - Cell - Buu Sagas: Destroyed
History: The first part of the Freeza Tokusentai was introduced in the Saiyan Saga, although it was unknown to our heros who the 3 Saiya-Jins were working for. Then in the Freeza Saga it was revelaled who was their boss: the all powerful Freeza. Also other members were revelaled such as Dodoria and Zarbon. This group was mostly destoryed by Son Goku, Vegeta and Mirai no Trunks
Names: Ginyu Force
Members - Saiyan Saga: Unknown
Members - Freeza Saga: Captian Ginyu, Reacoome, Burta, Jheese, Gurdo
Members - Android - Buu Sagas: Destroyed
History: The Ginyu Tokusentai was introduced in the Freeza Saga, when Freeza was having trouble with the Z Senshi and they promply arrived, in style! ^_^ They proceeded to steal the Dragonballs from our heros. Gurdo then squared off against Kuririn and Son Gohan, but he was killed by Vegeta. Vegeta then went up against Reacoome, who proved to be too much for the Saiya-Jin. But when Son Goku arrived he swiftly deafeated both Reacoome and Burta with one blow! Vegeta then killed both of them before levaing Son Goku to face Ginyu and Jheese. When Ginyu exchanged bodies with Son Goku, he left him for dead, but after tricking Ginyu into switch bodies with a frog and Vegeta had "dealt" with Jheese, the Ginyu Tokusentai was no more.
Members - Saiyan Saga: North Kaio
Members - Freeza Saga: North Kaio
Members - Android Saga: North Kaio
Members - Cell Saga: North Kaio
Members - Buu Saga: North Kaio, South Kaio, East Kaio, West Kaio, Grand Kai, Dai Kaioshin, Rou Dai Kaioshin
History: The Kaios are a race of people who are basically the gods of the Dragonball universe. The Kaio indroduced to us is North Kaio, or King Kai. He trains Son Goku, Piccolo, Yamcha, Tenshinhan and Chouzu. He is ruler of the North Section of the is galaxy. Above him is the Grand Kai, who rules over the four kaios. Above him is Dai Kaioshin, who rules the entire universe. Originally the East Kaioshin, and ruler of the west part of the universe, but when Buu killed every other Kaioshin and the pervious Dai Kaioshin, East Kaioshin became ruler by default. Rou Dai Kaioshin is the Dai Kaioshin from 15 generations ago, and is freeed from the legendary Z Sword by Gohan while training.
Urani Baba's Fighters
Members: Dracula Man, Invisble Man, The Mummy, Akuman, Grandpa Gohan
History: This group is first introduced to us way back in Dragonball. When Son Goku is unable to locate the last Dragonball Roshi suggests he tried "The All-Seeing Crone's Palace", or as Son Goku put it: "The All-Seeing Bone" ^_^ Uranai Baba is able to locate any object in the world, but for a price of 10,000,000 zenis! If unable to pay then they must face off against her 5 champions. When victorious she will find what they want. Many people are unable to get past the first opponent, Dracula Man, never mind beating Akuman and Grandpa Gohan. But our heroes manage it, with a lot of help from Son Goku!
**MORE TO COME SOON**