Stuart Fails to Save the Universe is the latest spin-off to much-loved sitcom The Big Bang Theory.

Four popular supporting characters from the original show take centre stage in this wacky new adventure.

Comic book store owner Stuart Bloom (Kevin Sussman) finds himself as the only one able to prevent a multiversal Armageddon.

Joining him are assistant manager/love interest Denise (Lauren Lapkus), geologist Bert Kibbler (Brian Posehn) and physicist Barry Kripke (John Ross Bowie).

Let’s take a look at everyone from The Big Bang Theory who has popped up so far.

Main characters

Stuart Bloom

Played by Kevin Sussman

Stuart first appeared in season two of The Big Bang Theory

He remained a recurring character for several seasons, before becoming a series regular from season six.

Early on, Stuart notably went on dates with both Penny (Kaley Cuoco) and Amy (Mayim Bialik).

Now in Stuart Fails, the geeky comic book store owner is tasked with averting a “multiversal Armageddon”.

Although perhaps the worst candidate for this insurmountable task, will Stuart be up to the challenge?

Interestingly, Sussman was first considered for the roles of Leonard Hofstadter and Howard Wolowitz.

Denise

Played by Lauren Lapkus

Denise debuted in season 11 of The Big Bang Theory, initially as assistant manager of Stuart’s comic book store.

She later became with his girlfriend, with this dynamic continuing into Stuart Fails to Save the Universe.

Although in a few universes so far, Denise has been romantically paired with Gary (Tommy Walker).

Bert Kibbler

Played by Brian Posehn

The beloved geologist Bert first arrived on Big Bang in season 6.

Introduced with a crush on Amy, he later became part of the gang’s wider social circle.

On Stuart Fails, Bert is positioned as Stuart’s best friend and sidekick – a role he didn’t have on the original show.

And the episodes so far have already had a wild ride for Bert; from gaining magic powers to getting married.

Barry Kripke

Played by John Ross Bowie

Rounding out the Stuart Fails regulars is Sheldon’s one-time rival Barry Kripke.

The physicist – who has a distinct speech impediment – starts out the show as a daily antagonist to Stuart, Denise and Bert.

But as they’re all having to work together, for better or worse, will Kripke become more of a team player?

Big Bang Theory Returnees

Raj Koothrapali

Played by Kunal Nayyar

One of the main characters of The Big Bang Theory, Raj appeared throughout the 12-season run.

His actor Kunal Nayyar was 26 years old when the show launched in 2007.

An alternate Raj featured in episode one of Stuart Fails – heavily bearded and living in a post apocalyptic world.

Another additional alternate version of Raj appears in episode six.

Penny (& Zack)

Played by Kaley Cuoco (Penny) and Brian Thomas Smith (Zack)

Penny was the female lead of The Big Bang Theory, appearing in almost every episode.

In the original series, Penny ultimately married Leonard (Johnny Galecki).

An alternate Penny appears in episode two of Stuart Fails.

This brunette Penny is a hardened Resistance leader in an AI-controlled universe.

Meanwhile, we’ll-meaning, dim-witted Zack recurred in several seasons of The Big Bang Theory.

Introduced in season three, he was an on-off boyfriend to Penny in the original show.

On Stuart Fails to Save the Universe, alternate Zack works alongside alternate Penny in the Resistance.

Ramona Nowitzki

Played by Riki Lindhome

Caltech grad student Ramona Nowitzki featured in seasons 2, 10 and 11 of The Big Bang Theory.

She notably had a huge crush on Sheldon Cooper (Jim Parsons).

Therefore, Ramona became a rival to Sheldon’s love interest Amy (Mayim Bialik).

In Stuart Fails to Save the Universe, Ramona makes a brief appearance as a receptionist in the AI world.

Christine Baranski

Played by Herself

Emmy-winning Christine Baranski played Leonard’s mother Dr. Beverly Hofstadter on The Big Bang Theory.

First appearing in season two, Baranski received two Emmy nominations for portraying analytical, emotionally distant Beverly.

Although in Stuart Fails To Save The Universe, the actress instead appears as herself.

This alternate version features on a video as the cheerful host of a re-education camp in the AI dystopian world.

Bernadette Rostenkowski-Wolowitz

Played by Melissa Rauch

Dr. Bernadette Rostenkowski debuted in The Bjg Bang Theory’s third season.

She later married and has children with Howard Wolowitz (Simon Helberg).

In Stuart Fails to Save the Universe, Bernadette is first said to be a sorceress.

However, an ending twist reveals her to actually be a demon.

This version doesn’t appear to be married to Howard, thereby making her Bernadette Rostenkowski.

Wil Wheaton

Played by Himself

Wil Wheaton had a long-running recurring role as himself on The Big Bang Theory.

The actor – who played Wesley Crusher on Star Trek: The Next Generation – was depicted as a rival to Sheldon.

Wheaton later played an alternate version of his fictitious self on Stuart Fails to Save the Universe.

Appearing in the magic universe, this Wheaton was a representative of the Wizards Guild of America.

In real life, the actor co-hosts the official Stuart Fails to Save the Universe podcast alongside Felicia Day.

Amy Farrah Fowler

Played by Mayim Bialik

Neuroscientist Amy Farrah Fowler debuted in The Big Bang Theory’s third season finale.

Mayim Bialik was promoted to a series regular in the fourth season.

She ultimately became Sheldon’s primary love interest and eventually his wife.

The alternate Amy in Stuart Fails to Save the Universe is a psychiatrist rather than a neuroscientist.

Who else pops up?

The show so far also features cameos from “Weird” Al Yankovic as well as Penn & Teller.

Teller previously played Amy’s father Larry on The Big Bang Theory.

Alums from other Chuck Lorre shows such as Jon Cryer (Two and a Half Men) and Louis Mustillo (Mike & Molly) have also guest starred.