Bumper Wars

The plot is as follows: you, the player, are guilty of flying in restricted space, which is a capital offense. Your sentence is to play in the eponymous Bumper Wars until you die. If you win 15 rounds, the Zeddites (the alien race that arrested you) will be forced to set you free. Lose one round and your fate is sealed.

Bumper Wars is a Vehicular Combat game from 2001, developed by Boston Animation and published by Simon & Schuster Interactive for PC.