Stuart Fails to Save the Universe has featured cameos from several The Big Bang Theory alums — but not every cast member has made their triumphant return to the small screen.

The HBO Max spinoff follows comic book store owner Stuart Bloom, who “is tasked with restoring reality after he breaks a device built by Sheldon and Leonard, accidentally bringing about a multiverse Armageddon,” according to the official synopsis.

Stuart “is aided in this quest by his girlfriend Denise, geologist friend Bert and quantum physicist/all-around pain in the ass Barry Kripke. Along the way, they meet alternate-universe versions of characters we’ve come to know…

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