Fueled by racial bigotry against the people who were the opposite color from himself, as he was white on the left side and black on the right side, he pursued a traitor named Lokai across the galaxy for 50,000 terrestrial years, until he found him on the USS Enterprise in 2268.
Bele possessed extraordinary powers. Like Lokai, he had a personal force field which protected him from weapons fire and blocked unwanted physical contact. In additional he had an electrical charge which could be used as a weapon, and mental powers that allowed him to take control of the Enterprise-powers Lokai does not have.
When Captain James T. Kirk refused to help him, Bele hijacked the Enterprise but released it when Kirk ordered the self destruct program. After the Enterprise finished its decontamination mission to the planet Ariannus, Bele again took control of the ship and returned to Cheron, only to find that years of racial tension had destroyed his world. He refused Kirk's offer to live in the Federation. Lokai beamed down to the dead planet, with Bele in pursuit, still obsessed with bringing Lokai to his warped sense of justice. (TOS: "Let That Be Your Last Battlefield")