Biff is a member of the Sakaaran Rebellion, who was forced to become one of the Grandmaster's champions. During the Escape from Sakaar, Biff joined Korg and Miek on a slave revolt. Later, he participated in the battle against Hela and survived.
He joined Korg, Miek and the Asgardian people in their journey towards the Earth following the complete Destruction of Asgard, only for the Statesman to be attacked by the Black Order, who promptly destroyed the spacecraft.
A New Fighter
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Biff fought alongside his fellow gladiators against the Sakaaran Guards and they ultimately reached the Grandmaster's garage. After accepting Loki as their leader, Biff and the other rebels seized the Statesman and flew it to Asgard.
The Statesman ultimately arrived near Asgard's Rainbow Bridge. Biff got off the spacecraft with his fellow rebels and began attacking Hela's Berserkers so that the Asgardians could escape the Goddess of Death's tyrannical rule.