The younger brother of Spider Man star James Franco joined the ABC show as a series regular in August, playing medical student Cole Aaronson.
Speaking to People, he said: "It's fun to play the bad guy. It's my chance to do and say things I would never dream of in real life."
When asked if his brother had given him any advice, he replied: "He's been great about letting me find my own path. When I do have a question, he's always there to answer it. The best advice he's given me is to never take a job because of money."
The ninth season of Scrubs premiered on ABC on December 1.