Double Trouble

Double Trouble is a movie starring Peter Paul, David Paul, and Roddy McDowall. Muscle-bound twins try to smash a jewel smuggling ring.
Two beefed-up twins operating on opposing sides of the law, team up to stop a nefarious crook in this actioner. Peter Jade is a notoriously arrogant burglar who ends up with the key to an enormous underground cache of diamonds. David Jade is a cop who joins forces with Peter after greedy Philip Chamberlain, wanting the diamonds for himself, kills David's partner