The Big Bang Theory Cameos

Keep track of every cast member and guest star from The Big Bang Theory who appears on Stuart Fails to Save the Universe.

Series Regulars

Kevin Sussman, Lauren Lapkus, Brian Posehn and John Ross Bowie reprise their Big Bang Theory roles as comic book store owner Stuart Bloom; his girlfriend and co-worker, Denise; Caltech geologist Bert Kibbler; and the ever-irritating physicist Barry Kripke.

Recurring Cast

Josh Brener plays Trevor, one of the regular customers at Stuart’s comic book store. Brener appeared in two episodes of The Big Bang Theory as Dale, an employee at the store.

Ryan Cartwright plays Kyle, another comic book store regular. Cartwright guest starred on The Big Bang Theory as Cole, one of Penny’s classmates at community college.

101 “Spoiler: Gary Dies”

Magicians Penn Jillette and Teller appear as themselves in the post-apocalyptic reality. The famously silent Teller played Amy Farrah Fowler’s taciturn father, Larry, on The Big Bang Theory and even spoke in one episode. Penn and Teller later appeared together on Young Sheldon as Acne Vulgaris and his sidekick, Pus.

Later in the episode, Kunal Nayyar returns as Raj Koothrappali. Stuart, Bert and Denise find Raj imprisoned in a room at Caltech, where years of confinement have left him a little unhinged. Despite that, he has worked out what went wrong with the universe and believes he can repair the vari-state quantum interference device.

Raj joins Stuart and Bert on an explosive journey through the university to reach the device. Before he can repair it and restore reality, however, Kripke fatally shoots him.

102 “Spoiler: Zack’s in This One”

Riki Lindhome reprises her role as Ramona Nowitzki, who works as a Caltech receptionist in the reality controlled by an artificial-intelligence overlord. Although outwardly friendly, Ramona proves less than helpful when Bert and Kripke try to reach Sheldon and Leonard, whose expertise they need to operate the quantum device.

Theater, film, and television’s Christine Baranski appears as herself in the introductory film shown at the re-education camp where Stuart, Bert and Kripke are imprisoned. Baranski played Leonard’s brilliant but emotionally distant mother, Dr. Beverly Hofstadter, on The Big Bang Theory.

Later in the episode, Kaley Cuoco returns as an alternate-universe Penny, now the leader of an armed resistance against the AI regime. Brian Thomas Smith also reprises his role as Penny’s good-natured but dim-witted ex-boyfriend Zack, who serves as one of her lieutenants.

The Resistance “rescues” Stuart, Bert and Kripke moments after their release from a thirty-month stay at a re-education center. When Penny discovers that neither the men nor their quantum device can help defeat the AI overlord, she orders their execution. A drone attack by the AI overlord gives the group an opportunity to escape, although Zack is shot in the assault.

103 “Spoiler: Bert is Magic”

Melissa Rauch reprises her role as Bernadette Rostenkowski in a world governed by magic. When Stuart and Kripke need mystical assistance with the vari-state quantum interference device, they are directed to Bernadette, a powerful sorceress.

Bernadette explains that the Wizards Guild of America stripped her of her powers after she helped bring a neighbor’s dog back to life. She persuades Stuart to give her some of his blood, which she needs to brew a potion that will restore her magic.

Later in the episode, Wil Wheaton plays a heightened version of himself, much as he did on The Big Bang Theory, where he evolved from Sheldon’s mortal enemy into a friend of the group. In this reality, Wheaton is an enforcer for the Wizards Guild of America. Furious that Stuart has aided the demon Bernadette, he arrives at the comic book store to kill him. Bert, who possesses magical powers in this universe, fights off Wheaton and eventually kills him.

Although the group initially dismisses Wil Wheaton’s warnings, Kripke soon alerts them to the fact that Bernadette is now a five-story-tall demon rampaging through Pasadena, crushing people underfoot and plucking them from buildings. She tears the roof off the comic book store in an attempt to seize the quantum device, but the gang escapes just in time.

104 “Spoiler: Stuart Makes a Wallet”

Mayim Bialik reprises her role as Dr. Amy Farrah Fowler, swapping neurobiology for psychiatry in this reality. Amy is treating Stuart, who has been confined to a psychiatric hospital because of his claims that he has traveled through alternate universes.

After Stuart learns that he and Denise are married and have children in this reality, he commits to getting better, and Amy eventually agrees to let him go home.

This page has been updated up to episode 104 Spoiler: Stuart Makes a Wallet