Who’s the Mystery Cameo in Peacemaker: Season 2? James Gunn’s Big Tease Decoded

The anticipation for Peacemaker: Season 2 is skyrocketing, especially with James Gunn, the mastermind behind the series and co-CEO of DC Studios, dropping hints about a massive cameo near the season’s end.

Fans are buzzing with speculation about who this game-changing character could be, given the show’s integration into the newly rebooted DC Universe (DCU). With the season set to premiere on August 21, 2025, on HBO Max, let’s dive into the clues, weigh the probabilities, and explore the most likely candidates for this blockbuster appearance.

Key Takeaways:

• James Gunn’s Tease: The creator of Peacemaker: Season 2 hints at a “really, really, really big cameo” in the finale, tied to the DCU’s broader narrative.

• DCU Connections: The cameo may link to Superman (2025) or other DCU projects like Supergirl or Lanterns, with characters like Maxwell Lord and Hawkgirl already confirmed.

• Multiverse Angle: The season explores alternate dimensions, potentially setting up a surprise from an unexpected DCU or even DCEU character.

• Fan Speculation: Names like Superman, Supergirl, Lex Luthor, and even Deathstroke are circulating as possible cameos.

What Makes This Cameo So Significant?

James Gunn has described the cameo as “really, really, really big,” suggesting it’s not just a fleeting appearance but a pivotal moment that could shape the DCU’s future.

Given Peacemaker: Season 2’s role as the third DCU project, following Creature Commandos and Superman, the cameo is likely designed to deepen the universe’s interconnectivity.

Gunn has confirmed the season ties directly to Superman, with characters like Green Lantern Guy Gardner (Nathan Fillion), Hawkgirl (Isabela Merced), and Maxwell Lord (Sean Gunn) appearing early on. This sets the stage for a major reveal that could either reinforce these connections or introduce a new player.

The season’s multiverse narrative, featuring a Quantum Unfolding Chamber (QUC) and an alternate Peacemaker, adds complexity. The cameo might originate from another dimension or serve as a bridge to future DCU projects like Supergirl (2026) or Lanterns.

Gunn’s emphasis on the cameo’s importance suggests it could be a character with significant star power or narrative weight.

Could Superman Himself Steal the Show?

David Corenswet’s Superman, fresh off the 2025 film, is a frontrunner for the cameo. Peacemaker: Season 2 takes place one month after Superman, and Gunn has confirmed multiple Superman characters will appear throughout the season.

A Superman cameo would make sense, especially since Peacemaker already appeared in Superman, establishing a reciprocal dynamic. The Man of Steel’s presence could elevate Peacemaker’s status in the DCU, especially if he’s being considered for a leadership role in a team like the Justice Gang.

However, Gunn’s cryptic phrasing and the fact that Superman is already a known entity in the DCU slightly lower the odds. A Superman cameo might feel expected, whereas Gunn has hinted the reveal will surprise fans. Probability: 35%.

Is Supergirl the Dark Horse Candidate?

Milly Alcock’s Supergirl, set to star in Woman of Tomorrow (2026), is another strong contender. She appears in a cameo at the end of Superman, making her a natural fit for Peacemaker: Season 2’s timeline.

Her introduction could set up her solo film, aligning with Gunn’s strategy of weaving DCU projects together. A Supergirl cameo would also bring a fresh dynamic, as her optimistic heroism contrasts with Peacemaker’s brutal pragmatism, potentially sparking compelling interactions.

The multiverse angle could further support this, with Supergirl possibly hailing from an alternate dimension. Her relative obscurity compared to Superman makes her a more surprising choice, fitting Gunn’s tease. Probability: 30%.

Might Lex Luthor Scheme His Way In?

Nicholas Hoult’s Lex Luthor, a key figure in Superman, is a tantalizing possibility. Luthor’s manipulative nature makes him a perfect fit for Peacemaker: Season 2’s morally gray world.

As a schemer who could exploit Peacemaker to counter Superman, Luthor’s cameo could introduce a major antagonistic force for future DCU projects. His tech-savvy persona also aligns with the QUC storyline, which Gunn has called central to the season.

However, Luthor’s prominence in Superman might make his appearance less shocking, and his lack of prior connection to Peacemaker lowers the narrative impact slightly. Probability: 20%.

Could an Unexpected DCU Hero or Villain Appear?

Gunn’s track record with obscure characters, like Peacemaker himself, suggests the cameo could be someone less predictable, such as Deathstroke or Clayface.

Fan speculation on X points to Deathstroke, with Gunn reportedly keen to use Slade Wilson since The Suicide Squad.

A Deathstroke cameo could set up a future conflict, given his mercenary background and ties to A.R.G.U.S. Clayface, with a 2026 film in development, is another possibility, offering a visually striking and surprising reveal.

Other names like Batman (seen briefly in Creature Commandos) or even a multiversal DCEU character like Henry Cavill’s Superman have surfaced, but these seem less likely due to Gunn’s focus on new DCU canon. Probability for an obscure character: 15%.

Why Does the Multiverse Matter for the Cameo?

The season’s multiverse plot, involving Peacemaker confronting an alternate version of himself, opens the door for a cameo from virtually any DC character.

The QUC, a device seen in both Peacemaker: Season 1 and Superman, could facilitate a crossover from another dimension, making even a DCEU holdover like Jason Momoa’s Aquaman possible, though unlikely given Gunn’s rejection of the Justice League cameo from Season 1.

This multiverse angle increases the chances of a character from an upcoming DCU project, like Lanterns or Waller, making a debut to tease future stories.

What’s the Most Likely Outcome?

Weighing the probabilities, Superman (35%) and Supergirl (30%) lead due to their established DCU presence and timeline alignment. Lex Luthor (20%) follows as a strategic antagonist, while an obscure character like Deathstroke or Clayface (15%) aligns with Gunn’s love for surprises.

The cameo’s placement near the season’s end suggests it will set up a major DCU event, possibly hinted at in Gunn’s comments about a surprising overarching narrative.

Fans should expect a character that ties Peacemaker: Season 2 to the broader DCU while delivering a jaw-dropping moment.

Some Closing Thoughts:

The mystery cameo in Peacemaker: Season 2 is poised to be a defining moment for the DCU, blending shock value with narrative purpose.

Whether it’s Superman, Supergirl, Lex Luthor, or an unexpected wildcard, Gunn’s tease has fans eagerly awaiting the August 21 premiere.

Tune in to HBO Max to see how this reveal shapes the future of DC’s cinematic universe.