Ben Tennyson, now 15, is trying to live a normal life after years of alien-fighting adventures with the Omnitrix, the powerful device that allows him to transform into alien heroes. But when a mysterious galactic bounty hunter named Eon arrives on Earth, reality is shattered — literally.

Eon is after a multiversal upgrade to the Omnitrix known as the Chrono Core, which threatens to collapse space-time and rewrite existence. Realizing the Chrono Core is hidden on Earth and linked to his Omnitrix, Ben reunites with his tech-savvy cousin Gwen and their no-nonsense former Plumber Grandpa Max.

Together, they must stop Eon from opening a dimensional rift that would unleash a legion of alternate Ben versions — some heroic, others corrupted. Along the way, Ben faces powerful foes including Vilgax, Kevin 11, and a dark version of himself called Ben Reaper, who believes the only way to preserve the multiverse is to destroy it.

As timelines clash and alien transformations spiral out of control, Ben learns that being a hero isn’t about power — it’s about responsibility, sacrifice, and trust.