SPOILER WARNING: This article contains spoilers for Uncanny X-Men #4, by Matthew Rosenberg, Kelly Thompson, Ed Brisson, Pere Perez, Rachelle Rosenberg and Joe Caramagna, on sale now.
After decades of speculation and vigorous fan debates, Marvel has finally answered one of the most pressing questions in the Marvel Universe: Who is the most powerful X-Man?
Despite the publisher's irregular use of nebulous terms like "Omega Level mutant," debates in comic shops and on message boards usually end up discussing the same small handful of powerhouse characters like the telepathic Jean Grey and Legion, Professor X's reality-warping son. Now, Uncanny X-Men #4 establishes that X-Man, aka Nate Grey, is Marvel's most powerful mutant. In addition to his remarkable actions within the story, Jean Grey and Legion essentially confirm that this alternate reality version of Cable is the strongest X-Man, describing him as an above-Omega Level mutant.
Over their past few adventures, the X-Men have been dealing with several crises, ranging from mutant riots to dinosaur outbreaks. At the end of Uncanny #3, a few bizarrely-dressed and seemingly brainwashed X-Men and villains arrived on the X-Mansion's doorstep and introduced themselves as the Horsemen of Salvation.
After Magneto and the other Horsemen promptly blew up Xavier's School in the last issue, this issue opens with the team returning to their apparent master, Nate Grey. In a dramatic attempt to save the world from itself and reshape it in his image, Nate telepathically reaches out to every mind on or around Earth and shares his vision for the future.
Moments later, Jean Grey appears to be shocked by that feat, stating not even Professor Xavier could do that, even "at his most powerful." And even though Jean's naturally an Omega Level telepath of the highest order and used to wield the universe-shaping power of the Phoenix Force, she still says that Nate's level of power was "unheard of."
Without breaking a sweat, his telepathic message connects with billions of minds simultaneously. He's strong enough to even reach Captain Marvel, who's in low orbit around the planet at that moment. On top of that, he already turned Magneto, Angel, Omega Red and Blob into his pawns, and put Kitty Pryde, the X-Men's current leader, and Apocalypse, one of the most powerful mutants of all time, in chains.
Later on in the issue, the reality-warping Legion underlines just how powerful Nate is by describing him as "more than" Omega Level, which is generally the term to describe Marvel's most powerful mutants. Legion, who's also an Omega Level mutant, claims that he feels somewhat responsible for X-Man's actions since he's essentially his creator. While Legion isn't always the most stable voice, he's not totally wrong about this.