We always thought James Wolk deserved a better shot at TV stardom that the measly two weeks his Fox drama "Lone Star" got back in 2010. Now he's lasted a whole season on "Mad Men" as eager young accounts man Bob Benson, who charmed his way into a cushy gig working the Chevy account in Detroit. In real life, Wolk charmed his way into the Robin Williams CBS sitcom, "The Crazy Ones" — which is why we haven't seen much of Bob lately.
The halls of Sterling Cooper & Partners have been filled with a lot of familiar faces lately. Here are more than 20 "Mad Men" guest stars we recognize from previous roles in TV and movies. — Dave Nemetz, Yahoo! TV