Goku is the hero of Dragon Ball Z, the most powerful warrior on earth and the first to become Super Saiyan in over 1000 years. When the Saiyans arrive, Goku learns the mysterious secret of his own past: He is a Saiyan formerly named Kakarot. Goku was sent to Earth as a baby to grow up and destroy the planet, but a head injury as a child scrambled Goku’s programming. Instead of growing up to become a destructive super-warrior,he became innocent and pure of heart, fighting for good. Goku is peaceful, good natured, honest, loving to his family and friends, loyal, trustworthy, brave. If he has a weakness, it is his trusting nature. He always finds the "good" in people when others don't see it, though Goku’s enemies sometimes take advantage of his naive trust. He originally trained under Master Roshi and wears his symbol until he trains under King Kai. Then he wears King Kai's symbol. Goku grows up and marries Chi-Chi. Together they have two sons: Gohan and (in a future episode) Goten. ATTACKS: KAMEHAMEHA - an energy attack launched with both hands from his side, taught by Master Roshi KAIO-KEN - boosts power level turning Goku red-hot, taught by King Kai SPIRIT BOMB - an enormous attack drawing energy from all living things, taught by King Kai.

Goten is the second son of Goku and Chi-Chi, and is Gohan’s little brother. Goten loves to train in martial arts. He quickly develops incredibly strong powers (he just naturally goes Super Saiyan) that enable him to fight alongside the adults in their mission to defend earth. Goten’s best friend is Trunks who is approximately one year older. They are often seen together. Goten goofs around when he fights, especially when fused with Trunks as Gotenks, where he makes up countless silly-named attacks. Pure of heart, he’ll quickly jump into danger to help his friends and family.

Intelligent, friendly and easy-going, Dr. Brief is Bulma's father and president of Capsule Corporation. Capsule Corp. makes the capsules Bulma often uses that turn into large objects like cars. His technical genius reveals why Bulma is so handy with machines. Dr. Brief repairs the spaceships so that Goku and the others can go to Namek. Mrs. Brief is the wife of Dr. Brief and mother of Bulma. Friendly and talkative, Mrs. Brief is seen mostly at home. She loves to have company and entertain guests.