10 Actors Who Guest Starred On Seinfeld Before They Were Famous

10. Bryan Cranston

Bryan Cranston appeared in five episodes of Seinfeld as Jerry's dentist, Tim Whatley. He manages to get up to a lot of shenanigans in this time, as he surprises Jerry by keeping Penthouse magazines in his waiting room, has a failed affair with Elaine, converts to Judaism just so he can make jokes about it, is their first re-gifter, and starts a Christmas present scam.

Cranston moved on to become the lovable, yet slightly unhinged, father on Malcom in the Middle. Though he's most famous for his later role as Walter White in Breaking Bad.