Tripping the Rift - Season 1 Episode 2 -

The crew is enlisted by the Confederation to kidnap Malik, a sports superstar who retired from the game of Mutilation Ball (a fast-paced but violent sport where players use chainsaws to disable their opponents), and bring him into the big game as a ringer. The crew then kidnaps Malak and brings him back to the ship, where T'Nuk inadvertently kills him - only to find out that he is a robot! Now they must find the real Malak and get him into the big game before the Confederation finds out.