When an actor with a popular role in the past has a resurgence doing something else.
Similar to Hey, It's That Guy!, only this is when someone was famous before, and not just a character actor.
Named for The Simpsons' Troy McClure, who used to be a character actor, and then did educational films, infomercials, etc. He would introduce himself with "Hi, I'm Troy McClure! You might remember me from [...] [tvtropes.org]