go on to Gotenks

The second son of Gokou and Chichi, Goten is a playful and curious boy that strongly resembles Gokou. Since his dad Gokou died during the Cell Saga, he grows up without a father. Instead, he looks up to Gohan, his older brother, and thinks he is the greatest in the world. He and his best friend Trunks (Vegeta and Bulma's son) are always getting themselves into trouble. He
and Trunks can also fuse together to become Gotenks, a strong, yet over-confident being with extremely silly attacks. Because Gokou was so strong when he and Chichi had him, Goten is born extremely powerful as well. He is able to become a Super Saiyan at the age of 7, making him the youngest Super Saiyan to date. He could have gotten much stronger, but by the end of Dragon Ball Z, he slacks off and doesn't train.