Deadpool 2 is officially in theaters and ruling the box office just like its predecessor did back in 2015. But this installment is about more than just crude jokes and over-the-top action scenes; it also includes the debut of a longtime Marvel character that fans have been clamoring to see on the big screen since 2000’s X-Men hit theaters: Cable.

But the Cable in Deadpool 2 isn’t quite the one fans have gotten used to in the books—for starters, his powers and backstory are reined in considerably. While it’s easy to assume that’s by design, so that audiences can better relate to the character (which is played by Josh Brolin), some fans have speculated that the changes are because, well, this character isn’t really Cable at all; instead, Screen Rant has a theory that this version of the character is actually none other than an older Wolverine from the future.

So how can Wolverine be Cable? Well, it’s actually quite easy, considering that Wolverine was Cable in Marvel’s Ultimate Universe comics, which was a series of books in the 2000s that completely reimagined the regular Marvel Universe. In this reality, a grizzled, aged Wolverine takes on the Cable nickname and travels back in time to prevent a takeover of Earth from the villain Apocalypse.

We were already introduced to Apocalypse in 2016’s X-Men: Apocalypse, and while he was defeated in the end, Screen Rant theorizes that he could return like he does in the Ultimate X-Men comics: by inhabiting the body of Nathaniel Essex, a.k.a. Mister Sinister. Essex was already name-dropped in Apocalypse and Deadpool 2, so it stands to reason that there might be some larger story on the horizon for him.

This would, of course, lead to more X-Men movies down the road, with Cable revealing his true nature and teaming with a crew of mutants that includes the classic X-Men cast as well as their younger selves to battle a newly formed Apocalypse. It’d also allow the character of Wolverine to live on in Brolin, leaving Hugh Jackman to enjoy a retired life without claws.

Obviously this is just one fan theory based on a comic storyline from over a decade ago. It would also have to ignore a whole host of continuity problems—including the events of Logan. But having a twist with Cable actually being Wolverine from the future (and likely from a different reality) is the type of headache-inducing madness the comics are known for.

[h/t: Screen Rant]