Who Plays Zack On The Big Bang Theory & What Happened To Him?

Brian Thomas Smith first appeared in a Chuck Lorre show in 2006, playing Emmett on an episode of “Two and a Half Men.” His performance as Zack on “The Big Bang Theory” must have stuck with the prolific showrunner because Smith was cast as Freddy in the Lorre-produced “United States of Al.”
“United States of Al” premiered on CBS in 2021 and follows the friendship between Marine veteran Riley (Parker Young) and his Afghan interpreter, Al (Adhir Kalyan), as they settle in Ohio. There, Riley reconnects with his daughter, Hazel (Farrah Mackenzie), and his estranged wife, Vanessa (Kelli Goss). Freddy is Vanessa’s goofy, well-meaning boyfriend with a passion for magic.
Smith joined the series halfway through Season 1, so he was thrilled to have an even bigger role when the show was renewed for a 2nd season. “David [Goetsch] and Maria [Ferrari], who created the show with Chuck Lorre, they brought me in around Episode 6,” the actor said on the “Traversing the Stars” podcast. “They got the news that there was a Season 2, and it was so cool because they ended up using me [for] 11 out of 22 episodes. As a recurring actor, that’s pretty cool. Especially with the way it went down on ‘The Big Bang Theory.’ [They used] Zack once or twice a season for nine seasons.”
“United States of Al” was canceled after two seasons, but Smith has stayed busy. He landed roles on episodes of Nickelodeon’s “The Really Loud House” and the Christmas movie “Holiday Twist.”
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