The Mod Squad (1968)

Season 3: Episode 23

While working undercover as safe crackers, Pete and Linc meet a timid, clumsy young man who asks them to teach him about their trade. They learn that the young man has a twin brother who is a successful businessman. What they don't know is that the businessman is actually the leader of the industrial spying ring they are trying to investigate. And that's only the start of the surprises to come.