Other source:
Gohan asks Bulma for help designing a costume for his new persona, the Great Saiyaman. He learns that Trunks and Vegeta have been training vigorously. Because he can fly with his new costume without revealing his identity, he give Nimbus to his little brother, Goten, whom Chi Chi was pregnant with during the Cell games. Gohan uses his superhero powers to save a bus of senior citizens from a hijacking.
