Stuart Fails to Save the Universe is an upcoming sci-fi comedy spin-off of The Big Bang Theory centered on comic book store owner Stuart Bloom, played by Kevin Sussman.
The series follows Stuart after he accidentally breaks a device created by Sheldon and Leonard, triggering a multiverse-level catastrophe that threatens reality itself. To try to repair the damage, Stuart teams up with his girlfriend Denise, geologist Bert, and the ever-annoying physicist Barry Kripke. Along the way, they encounter alternate-universe versions of familiar characters from the original show, leading to a mix of science-fiction chaos, dimension-hopping adventures, and awkward comedy. As the title suggests, Stuart’s attempts to save existence do not go smoothly.
The show is described as a “science fiction action-adventure comedy” created by Chuck Lorre, Bill Prady, and Zak Penn. Returning cast members include Lauren Lapkus as Denise, Brian Posehn as Bert, and John Ross Bowie as Barry Kripke.
It premieres on HBO Max in July 2026.