Only humans contaminated, transform stem cells - mutated genes / DNA, not aliens & gods (eg Superman, Thor). Level relative strength powers almost superman self.
Apollo, Black Bolt, Captain Atom, Sentry/Void, Wonderman, Hulk, Rulk vs
Goku, Piccolo, Gohan, Krillin (later retires), Tien Shinhan (later retires), Chiaotzu (later retires), Yamcha (later retires), Yajirobe (later retires), Vegeta (joins after Frieza Saga), Future Trunks (returns to alternate timeline), Future Gohan (alternate timeline), Trunks, Goten, Android 18 (joins after Androids Saga), Majin Buu (changes ways, merges with Uub in DBGT), Uub (DBGT), Pan (DBGT)
Villains: Frieza, Kid/Super Buu, Cell, Broly