The new Stuart Fails to Save the Universe series has arrived on HBO Max, and it brings a completely different version of Pasadena than what viewers remember from The Big Bang Theory. The spin-off drops audiences into a ruined world where giant moths attack the streets, zombie hands rise from the ground, and survivors trade their last canned goods for food. The show follows Kevin Sussman as Stuart Bloom, the awkward comic book store owner, who must fix reality after breaking a device built by Sheldon Cooper, Leonard Hofstadter, and Howard Wolowitz.
Series co-creator Bill Prady recently sat down with Variety to explain the science behind the show’s multiverse rules. He discussed how the series uses real quantum physics to build its story while still keeping things simple enough for everyone to follow.
Bill Prady Explains the Quantum Physics Behind the Show
The multiverse concept starts from the very first episode. Leonard, Sheldon, and Howard built a quantum interference device that caused reality to shift. According to Prady, the device moved the main characters into a parallel universe with its own separate history.
When asked about characters moving between universes, Prady gave a clear example using the show’s events. He explained that if a character like Kripke kills Raj in one universe, that Raj never actually existed in that reality. Prady stated:
“Either the universe they just left doesn’t exist anymore, in which case he didn’t kill Raj because that Raj never existed, or that we are dealing with an infinite number of universes.”
This means Kripke could only have killed one Raj out of an endless number of Rajs across all realities.
Prady also introduced the branching theory of multiverses. This theory says every quantum event can go in more than one direction. At that moment, the universe splits into branches where both outcomes exist at the same time. Prady explained:
“The theory is that the universe branches at every decision point, so there’s a rapidly growing, infinite number of universes.”
He also mentioned that some infinities are larger than other infinities. This idea is mathematically correct but hard for people to accept. From the moment of the Big Bang, the number of parallel universes keeps growing with every passing second.
Kevin Sussman on Understanding the Science
Kevin Sussman, who plays Stuart, credits Prady with having a strong grasp of the science behind the show. Sussman said:
“There’s a bunch of quantum physics involved in the show, and Bill is an expert on quantum physics theory. You can get away with a lot because at the end of the day, it is theory. It’s popular theory, but it’s legit.”
Sussman admitted he would ask Prady questions about how his character could be in two places at once. He had a moment of realization when he understood that the show involves not just parallel universes but also a mix of time travel.
Sussman added that he expects fans to debate the science online:
“I look forward to people on Reddit trying to dissect what’s happening because I know that all of it can be argued. I would try to poke holes in it on set, and Bill always walked me through. ‘No, see, the reason why this does make sense is A, B and C.’”
The Einsteinian Issue and Time as a Fourth Dimension
Prady also addressed what he called the “Einsteinian issue” in the show. He explained that time acts as a fourth dimension. When the quantum device malfunctions, it changes reality and also creates a new past. This means the characters exist in a timeline that has been rewritten.
The origin of the multiverse story begins at The Comic Center of Pasadena, the comic book store where The Big Bang Theory characters often spent time. In episode 1, Bert goes to the store to trade food cans for a rare Batman #608 comic. While the real Stuart throws trash through a dimensional cut in space, another Stuart from a different world suddenly appears.
Chuck Lorre on Choosing Stuart as the Lead
Series co-creator Chuck Lorre explained why he chose Stuart, a supporting character, to lead the spin-off. Lorre told People magazine that Stuart was “the absolute worst choice to be the hero of this story, which made him the perfect choice”.
Lorre said there was never any debate about who should lead the show:
“No. No, it was always Kevin. And right from the very beginning it was Kevin, and the comic book story was.”
He described Sussman as a brilliant comic actor who audiences can root for despite his flaws. The show transforms the franchise into what Lorre calls a “science fiction action adventure comedy”.
The Show’s Approach to Plot Holes
The creators purposely included plot holes and confusing storylines in the first season. During an interview with Us Magazine, Zak Penn joked about keeping track of everything. Lorre admitted they were actually “clueless” about the big picture at times.
Penn said:
“If they don’t [have plot holes] then we didn’t do our job.”
Prady noted that the characters in the show also notice these inconsistencies. Lorre added that viewers should focus on the comedy rather than searching for plot loopholes.
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Returning Cast Members and New Versions of Old Characters
Kunal Nayyar returns as Raj Koothrappali in the premiere episode. The show also features Lauren Lapkus as Denise and Brian Posehn as Bert. John Ross Bowie plays Barry Kripke, who has become a ruthless gang leader controlling much of the San Gabriel Valley.
Kaley Cuoco and Melissa Rauch are also set to appear as different versions of Penny and Bernadette. Chuck Lorre explained the approach:
“Yes, we’re going to ask you to come back as Penny, but not the Penny, an entirely different Penny, a different Bernadette. I think it was a challenge; it made it fun. They know how to do the older versions of those characters, here is an opportunity to create something new.”
Kevin Sussman admitted he was in shock when first pitched the series:
“Initially I thought, this can’t be happening. And then I thought, but it seems like it’s happening. I’m pinching myself and I’m still here, and so I should actually try to listen to what the man is saying.”
Stuart Fails to Save the Universe premiered on July 23, 2026, on HBO Max. The series marks the latest expansion of The Big Bang Theory franchise, which has continued through Young Sheldon and Georgie & Mandy’s First Marriage.
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