- Primary Subject: A returning guest star in the upcoming The Big Bang Theory spinoff series, Stuart Fails to Save the Universe
- Key Update: A new HBO Max teaser for the upcoming Big Bang Theory spinoff revealed that a fan-favorite guest star will return.
- Status: Confirmed
- Last Verified: May 25, 2026
- Quick Answer: The new trailer for The Big Bang Theory spinoff confirms Wil Wheaton returns as a multiversal villain, opening the door for more franchise cameos.
A new teaser for the upcoming The Big Bang Theory spinoff, Stuart Fails to Save the Universe, revealed the return of a fan-favorite guest star from the mothership series.
This coming summer, the long-awaited new spinoff of the beloved sitcom is set to premiere and will focus on the fan-favorite supporting characters, led by Stuart Bloom. Fans have been looking forward to seeing whether other characters from the mothership series are set to make appearances as well.
Which Big Bang Theory Guest Star Will Appear in Stuart Fails to Save the Universe?
A new HBO Max promo teaser, which included new footage from Stuart Fails to Save the Universe, revealed that Wil Wheaton will appear in the upcoming spinoff series.
As long-time fans of The Big Bang Theory know, the Star Trek: The Next Generation alumnus was a fan-favorite guest star who appeared in many episodes throughout its 12-season run. He played a fictionalized version of himself.
The teaser showed a quick look at Wheaton, playing a fictionalized version of himself from another universe, terrorizing Stuart and the gang with his superpowers.
This is an exciting tease for fans, since it confirms that a major The Big Bang Theory player, aside from the returning stars who lead the spinoff, will appear, even if it's a multiversal version.
Wheaton’s return opens the door for more guest appearances, even though it's uncertain at the moment if any of the core Big Bang Theory cast will cameo. Furthermore, reimagining established characters with multiversal versions is a clever way to expand the franchise.
Now, fans are waiting to see whether they should expect more surprise guest appearances from the mothership series in the upcoming spinoff, especially the likes of Sheldon, Leonard, Penny, and other main characters. This teaser showed that anything is possible at this point.
What is Stuart Fails to Save the Universe About?
Stuart Fails to Save the Universe 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.
Stuart is aided in this quest by his girlfriend Denise, geologist friend Bert, and quantum physicist Barry Kripke. Along the way, they meet alternate-universe versions of characters we’ve come to know and love from The Big Bang Theory. As the title implies, things don’t go well.
The main cast includes Kevin Sussman (as Stuart Bloom), Lauren Lapkus (as Denise), Brian Posehn (as Bert), and John Ross Bowie (as Barry Kripke).
The series will premiere on July 23 at 9:00 pm ET on HBO Max. New episodes will be released weekly every Thursday. The first season will consist of ten episodes.
Keep it locked on Epicstream, your go-to site for film, TV, and celebrity coverage!