The Wonderful World of Disney (1961) - 31x22 - Double Agent- Followmy.tv

Jason Starr is an international spy. While on a mission there was an altercation and Jason disappears. His boss Vaughn then goes to his twin brother Warren Starbinder, a veterinarian, and asks him to pose as Jason so to complete his mission. Which he agrees to but won't be easy since he is not a spy. And he also can't tell his wife and family what he's doing. Which makes it hard for him to explain the peculiar way he is now behaving.