Dragon Ball GT - episode 26 - 15 Oct, 1996

Goten and Baby begin to fight. Baby baits Goten into powering all the way up. Then, he takes control of his body. Baby, as Goten, heads back to Capsule Corporation, eager to find Vegeta, whom he knows is the strongest of the Saiyans on Earth. Meanwhile, Goku, Trunks, and Pan find the three-star ball, and are now just one Dragon Ball away from finishing their quest. Back on Earth, Gohan realizes that something isn't right, and brings Goten out into the country. Gohan tells him that he knows that something is possessing him. Baby, sensing that Gohan is even stronger than Goten, tries to bait Gohan into releasing his full power by unleashing Goten's power on the Earth. Gohan is forced to power up to stop him, and when Gohan has his guard down, Baby switches bodies. Piccolo arrives, but is quickly cut down. Baby, as Gohan, continues his search for Vegeta. (Source: Wikipedia)