A Lookback Of Every Characters In The Big Bang Theory. Who Is Your Favorite?

Brian Thomas Smith as Zack Johnson

Tomas Smith plays as the on-and-off boyfriend of Penny. St. Louis, Missouri born and bred, Brian Thomas Smith is an actor and producer. The 41-year-old actor, who is well known for his works on Danny Collins and The Wedding Party, is also a member of the sketch comedy troupe, The Exploding Pajamas. 

Brian Thomas Smith As Zack Johnson