Stuart Fails to Save the Universe has taken an unusually direct trip into DC territory in its first season, staging a live-action confrontation between Jay Garrick's Flash and Batman villain Mr. Freeze. The ninth episode of the Big Bang Theory spinoff, titled "Spoiler: We Couldn't Get Green Lantern," sends Stuart Bloom and his universe-traveling group into a realized Gotham City, where a comic-book joke rapidly becomes a full superhero encounter.
The episode's title is not merely a throwaway gag. Co-creator Zak Penn has explained that Green Lantern was the production's initial hope for the story, but the character could not be used because of HBO's ongoing live-action Lanterns series. Rather than trying to force a version of Hal Jordan or John Stewart into the episode, the show shifted to a different DC icon whose abilities fit the multiverse premise especially well: the Flash.
That decision resulted in Andy Ridings playing a live-action Jay Garrick, the Golden Age Flash, while Eric Allan Kramer appears as Victor Fries, better known as Mr. Freeze. It is a deliberately heightened pairing, and one that leans into the visual contrast between a brightly costumed speedster and a large, mechanically outfitted ice-themed villain.
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A Gotham City Stop With Real Superhero Spectacle
Stuart Fails to Save the Universe has built its premise around cosmic mishaps and travel between realities, giving the comedy room to visit settings that would be impossible in a more grounded sitcom. Episode 9 makes especially broad use of that freedom. Stuart and his companions arrive in a Gotham City that operates by comic-book logic, and Mr. Freeze soon emerges as a major problem rather than a fleeting visual reference.
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Kramer's version of Fries is equipped for a proper supervillain sequence. He fires deadly icicles, creates substantial walls of ice, and threatens Stuart with an enormous frozen bowling ball. The production does not treat the encounter as a simple costume cameo or an off-screen punchline. Within the episode's comic framework, Freeze is presented as a dangerous obstacle whose powers call for an equally super-powered solution.
That solution comes in the form of Garrick. Ridings' Flash races into the action, saves the day, and gets in several one-liners along the way. The character's arrival also gives the episode an opportunity to acknowledge the specific comic-book history being borrowed. There is a joke about the Golden Age Flash being better suited to battling Captain Cold than Mr. Freeze, a knowing nod to the rogues traditionally associated with different corners of DC's superhero catalog.
The choice of Jay Garrick is notable on its own. The helmeted original Flash has often remained a more specialized piece of DC lore for audiences familiar with the character's long publication history, compared with successors Barry Allen and Wally West. Bringing him into a live-action comedy setting preserves that older, pulpier visual identity while also making the guest appearance distinct from a standard modern Flash interpretation.
Why Flash Replaced Green Lantern
Penn said the creative team understood why Green Lantern was unavailable. Lanterns is still airing, with its next episode set to arrive on September 20, 2026, and the series is actively developing its own versions of Hal Jordan and John Stewart. Using either character in a wildly different, openly comedic multiverse story could have created needless overlap for viewers.
The restriction initially prompted some frustration in the writers' room, Penn said, but he and fellow co-creator Bill Prady made the case that Flash could ultimately serve the episode better. A speedster is an intuitive fit for a story involving dimensions and sudden shifts in reality. Flash's core concept is built around impossible movement, urgent rescues, and scientific comic-book excess, all qualities that make him a natural guest in a universe-hopping sitcom adventure.
There is also a tonal advantage. Lanterns has earned attention for approaching its Green Lantern leads with a more grounded style. Stuart's detour into Gotham is something much more knowingly artificial and playful: a place for exaggerated villains, brightly colored heroes, broad genre references, and a showdown that can include an ice bowling ball. Flash allows the spinoff to use recognizable DC imagery without competing with the specific dramatic identity of the ongoing Green Lantern series.
The episode's title turns the production limitation into part of the entertainment. Rather than disguising the fact that another hero was considered, it foregrounds the behind-the-scenes reality as a joke. That kind of self-aware approach suits a franchise built around characters who are deeply familiar with science fiction, superheroes, and the sometimes messy rules behind fictional universes.
A Rare New Live-Action Flash Appearance
The cameo has also drawn attention because DC currently has no active central live-action Flash or Mr. Freeze in its current screen lineup. For many viewers, the appearance of Garrick is the first chance to see a live-action Flash since Ezra Miller portrayed Barry Allen in 2023's standalone film. This is not a new launch for the character in the DCU, nor is it a signal that Ridings will take on the role beyond this episode. It is instead a contained appearance tailored to Stuart Fails to Save the Universe.
Even so, the response has focused on how convincingly the episode captures the basic pleasures of superhero designs in motion. Fans have highlighted the quality of Garrick's costume, as well as the fun of placing the colorful speedster opposite the bulky, industrial silhouette of Mr. Freeze. That response speaks to the enduring appeal of DC's visual language: even in a comedy spinoff, a recognizable hero suit and a classic villain outfit can immediately communicate the kind of story being told.
The encounter also shows how much range there is in the characters themselves. Mr. Freeze can be portrayed as tragic, terrifying, campy, or, as here, an outsized obstacle in a science-fiction comedy. Flash can anchor a large-scale blockbuster, carry a television drama, or dash into a crossover for a quick burst of optimism and momentum. Stuart Fails to Save the Universe uses both figures for a comic collision rather than a continuity-defining event, which may be exactly why the sequence can feel so freewheeling.
What It Means for the Spinoff's First Season
The Gotham episode arrives near the end of the show's debut run. The first season will conclude with Episode 10, due next week. With only one installment left, Episode 9 serves as a statement of how far the series is willing to push beyond the familiar apartment-and-comic-shop world associated with Stuart Bloom.
That does not mean the show has suddenly become a permanent DC crossover series. The Green Lantern limitation itself is a reminder that character use is shaped by separate productions, differing tones, and larger franchise plans. But the Flash and Mr. Freeze sequence demonstrates that the spinoff's multiverse setup can make room for ambitious genre detours when the situation calls for them.
For longtime fans of The Big Bang Theory, the appeal is easy to understand. Comic-book fandom was always central to the original show's humor and character dynamics. Stuart, in particular, has long been connected to that world through his comic store and his place among people who live and breathe genre culture. Putting him face-to-face with actual DC figures turns years of references into an absurd payoff.
For DC viewers, meanwhile, the episode offers a compact and self-aware look at two characters not currently headlining the franchise's live-action plans. Jay Garrick gets a chance to run again, Mr. Freeze gets an arsenal worthy of his name, and the whole scenario is built around a joke that somehow escalates into a real superhero battle.
Stuart Fails to Save the Universe may have started with a Green Lantern-shaped gap in its plans, but its replacement turned out to be more than a consolation prize. By using Flash's dimension-friendly powers and Mr. Freeze's instantly recognizable menace, the series found a crossover that fits its own chaotic comedic identity--and gave its first season one of its most unexpected spectacles.
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