Kabam Announces ‘WB All-Star Mayhem’ Multiverse Mobile RPG, With Regional Testing Set to Begin This Month

Crossovers have steadily become a dominant force across virtually every major entertainment medium in recent years, seamlessly bridging the gaps between disparate franchises in cinema, comic books, and television. Naturally, the video game industry has embraced this cross-pollination trend with open arms, continually seeking fresh ways to bring iconic intellectual properties together into shared interactive spaces. Now, publisher and developer Kabam is preparing to dive deep into the vast entertainment vault of one of the industry’s biggest media conglomerates with the newly announced mobile title, WB All-Star Mayhem.

Set to launch its first phase of limited regional testing later this month, WB All-Star Mayhem is an upcoming mobile role-playing game designed for both iOS and Android devices. The title brings together an eclectic, star-studded roster of beloved characters spanning decades of animation and pop culture history. Players can expect to see familiar faces from popular series such as Adventure Time, Steven Universe, Samurai Jack, and Scooby-Doo! interacting within a single, expansive digital universe.

The narrative catalyst for this chaotic crossover revolves around one of animation’s most infamous

schemers: the megalomaniacal mouse Brain from the classic series Animaniac’s. In the game’s setup, Brain manages to get his paws on a powerful universal remote control. True to form, his ultimate ambition is to harness the device to conquer each distinct universe one by one, leaving it up to a disparate band of heroes to step up, form an unlikely alliance, and put a definitive stop to his grand plan.

Multiversus the Forces of Brain

For many gaming enthusiasts, the premise of a massive, multi-franchise Warner Bros. crossover will immediately evoke a sense of déjà vu. The concept bears a striking resemblance to the trajectory of MultiVersus, the platform fighting game developed by Player First Games that drew heavy inspiration from Nintendo’s Super Smash Bros. That title similarly threw a diverse collection of Warner Bros. properties into the ring together, featuring everything from classic Looney Tunes characters and iconic DC Comics superheroes to unexpected additions like horror icon Jason Voorhees.

The history of MultiVersus, however, serves as a cautionary tale for anyone looking to build a massive crossover universe in the modern gaming landscape. Despite initial enthusiasm and a massive player turnout during its early availability phases, the game ultimately faced significant hurdles, leading to it being temporarily pulled from digital storefronts and the eventual closure of the development studio behind it. Breaking into competitive multiplayer genres is notoriously difficult—a challenge recently underscored by other major industry players, such as Riot Games, which has experienced its own lengthy development and testing cycles with titles like the fighting game 2XKO.

While MultiVersus sought to conquer the demanding platform fighter genre, Kabam is charting a different, arguably more familiar course with WB All-Star Mayhem. Rather than a twitch-reaction fighting game, Kabam is leaning into the RPG genre, a space where the studio has established a substantial track record over the years.

Kabam is widely recognized by mobile gamers as the studio behind Marvel: Contest of Champions, a popular and remarkably long-running mobile fighting and action RPG title based on Marvel’s extensive superhero roster. Having successfully operated and maintained a major superhero crossover game for many years, the development team possesses deep institutional knowledge and technical experience in managing licensed intellectual properties on mobile platforms. This background suggests that WB All-Star Mayhem will benefit from seasoned hands as it attempts to find its footing in a crowded mobile marketplace.

Whether WB All-Star Mayhem will manage to carve out a sustainable niche or suffer a fate similar to past high-profile crossover attempts remains to be seen. For now, anticipation will center on the upcoming regional testing phase slated for this month, which will give early testers their first hands-on look at how these iconic characters interact within Kabam’s new role-playing framework. As development continues, only time will tell if Brain’s latest plot to conquer the multiverse will result in a lasting mobile hit.