The full story
Wade Wilson is having a midlife crisis. Six years after defeating Cable, he's tried and failed to join the Avengers, broken up with Vanessa, and returned to selling cars. His life has no meaning. Then the Time Variance Authority shows up.
Paradox, a mid-level TVA agent, explains the problem: every universe has an anchor being whose existence stabilizes that timeline. In Wade's world, that anchor was Logan—and Logan is dead. Without him, Wade's entire universe will slowly decay into nothing. Everyone he loves will cease to exist.
The TVA offers a deal: Wade can live, relocated to the Sacred Timeline, but his world dies. Wade refuses. Instead, he steals a TemPad and goes hunting across the multiverse for a Logan willing to save his home.
He finds dozens. Logans who are short. Logans who are old. A Logan who's a literal wolverine. None of them will help. Finally, in a bar in a dead universe, Wade finds "the worst Wolverine"—a Logan so broken, so hated, that his entire world is gone because of what he did. This Wolverine failed when it mattered most. Everyone died because of him. He drinks because he can't die.
The TVA catches them both and dumps them in the Void—the wasteland at the end of time where pruned variants go to die. It's ruled by Cassandra Nova, Charles Xavier's twin sister, a psychic parasite who was never born in most timelines. She's built a kingdom of discarded variants: Sabretooth, Pyro, Toad, Azazel, and dozens more. She wants the Time Ripper to destroy every timeline outside the Void, leaving herself ruler of the only reality left.
The Void is a graveyard of dead franchises. A crashed Ant-Man helmet the size of a mountain. A rusting helicarrier. A 20th Century Fox logo half-buried in dirt. Wade and Logan fight through it all, bickering constantly, neither trusting the other. Logan doesn't want redemption. Wade won't stop pushing.
The allies they find are perfect: Elektra, Blade, Gambit (finally), X-23—all variants pruned from dead timelines, all forgotten by the multiverse. They help Wade and Logan reach Cassandra's base. The Time Ripper runs on a matter/anti-matter circuit that can only be shut down by completing it from both ends at once. Logan grabs Wade's hand and extends his claws to close it; together they channel the overload through both their healing factors, surviving what would kill either of them alone. Cassandra Nova is destroyed in the blast.
They survive. Barely. Wade's universe is saved. Logan doesn't find redemption—that would be too easy—but he finds something to fight for. They end up in the main MCU timeline, their Fox universe preserved, mutants officially part of the Sacred Timeline.
This Logan carries different guilt, different demons—a variant shaped by watching his entire world die because of what he didn't do. Wade's jokes have stakes because his world genuinely almost ended. And the cameos—so many cameos—serve the story rather than just fan service.