Raditz

Saiyan Survival Saga
At the time of Planet Vegeta's destruction Raditz was away on a mission with Vegeta and Nappa clearing another planet. Because of this these three Saiyans were told by Frieza that they were the last survivors, and that their planet was destroyed by a meteorite. It wasn't until the three Saiyans met up with Bardock and Gine that they would learn it was Frieza who destroyed their planet. After learning this Raditz gladly joins his father's resistance and helps to come up with the power ball technique.

Resistance Saga
When Bardock says that its time for them to go and get Kakarot Raditz offers to be the one to go and find him on Earth. But Gine wishes to go as well, so the two Saiyans head off together in search of the last member of their family. When the two arrive on Earth they are startled by the high power level they pickup initially believing that its Kakarot. However when they arrive they discover the strength is coming from Garlic Jr., Raditz easily defeats Garlic and is the one who pushes him into the Dead Zone locking him away. After learning about the ability to sense ki Raditz and Gine stay on Earth for another year waiting for the Dragon Balls and training more. Raditz gets to meet his brother's family and accept that he now is known as Goku.