Brian Smith

Brian Thomas Smith is an American actor and comedian known for playing the dim-witted but kind-hearted Zack Johnson in The Big Bang Theory for nine seasons. He has also made other TV appearances on Fear Factor, Two and a Half Men, Happy Endings, The Neighborhood, 9-1-1: Lone Star, and United States of Al. On the big screen, Smith starred opposite Al Pacino and Annette Bening in Dan Fogelman's directoral debut film, Danny Collins. Other films Smith has starred in include Lethal Seduction, Babysplitters, The Wedding Party, and Concrete Blondes.

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THE BIG BANG THEORY · S7, E11

The Cooper Extraction

While Sheldon is away in Texas, everyone gathers to decorate the apartment Christmas tree, and imagines what their lives would be like if they had never met Sheldon.
THE BIG BANG THEORY · S7, E9

The Thanksgiving Decoupling

An upset Sheldon protests when the entire gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.
THE BIG BANG THEORY · S4, E5

The Desperation Emanation

Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
THE BIG BANG THEORY · S4, E10

The Alien Parasite Hypothesis

Amy finds she has sexual feelings for Penny's ex, Zack (guest star BRIAN THOMAS SMITH) while Koothrappali and Wolowitz try to prove who would be the better superhero.
THE BIG BANG THEORY · S9, E22

The Fermentation Bifurcation

Sheldon and Bernadette spend a night together while the rest of the gang goes to a wine tasting party, but things get uncomfortable for Raj when Zack also attends and takes an interest in Claire.

Brian Smith

Director

Producer

Guest Appearances