A former boxing champion, in the heavyweight category, accepts to challenge the current title holder, under the apparent intention of the promoters to do a charity event. But when he is advised to take a fall, he refuses. Some minions have kidnapped his father and then have proceeded to blackmail him into accepting the match. Sam steps in to help the former champion.

Gemini Man Sam Casey goes undercover as an LAPD trainee to investigate a decorated officer who may be a sleeper Soviet assassin.