Calypso is a character in the Twisted Metal series. He runs the Twisted Metal contests and has the ability to grant wishes as a reward for winning his contests. In most cases, he twists the winner's wish somehow, often harming the individual instead of benefiting them; however, he is known to be charitable at times, as with Marcus Kane (driver). The extent of his abilities is still unclear, varying per wish.
The only game Calypso is playable in is Twisted Metal 4, whereas in the other games, he only appears in the opening and ending cutscenes.