Tonton Streaming Police Squad! (1982) S1E2 - Ring of Fear (A Dangerous Assignment)

Frank investigates a veteran boxer who lately has been throwing his fights. He takes the boxer under his wing in order to expose the boxer's corrupt manager. Unfortunately, the manger has kidnapped the boxer's girlfriend and put the boxer's title fight in jeopardy. Frank now tries to save the boxer's girlfriend in the hopes that the boxer won't have to throw the match so he can have a shot at rejuvenating his career in the ring.