The following contains spoilers for She-Hulk: Attorney at Law Season 1, Episode 6, "Just Jen," which debuted Sept. 22, on Disney+.
Ever since Ms. Marvel introduced the concept of mutation into the Marvel Cinematic Universe, it's been a countdown to more mutants. Mister Immortal (David Pasquesi) is a middle-aged man who, apparently, cannot die. Yet, given the way the MCU is handling homo superior, he might just be the second mutant to be revealed in the MCU.
While some fans balk at the changes made to Kamala Khan for the MCU, film and television adaptations are often about simplifying complex origins that work best in the pages of comics. While Craig Hollis, Mister Immortal's government name, is technically a mutant in the books, the origin of his immortality is, well, more complex. Ultimately, his immortality came from a being called Deathurge who worked for a villain named Maelstrom. None of this is important to the MCU, because obviously the MCU's Mister Immortal isn't out there trying to be a hero but just a guy who takes "until death do us part" too literally. The reason he might the MCU's second mutant is the same reason Kamala Khan is a mutant: it all goes back to Inhumans.
Even though Anson Mount's Black Bolt showed up in the MCU, Inhumans are unlikely to show up in a big way in the MCU. They were used as a side-plot of the not-canon Agents of S.H.I.E.L.D. to turn the mutant Quake (Chloe Bennet) into a character they could use. This was followed by the short-lived, regrettable Inhumans TV series. Half-human, half-Kree beings who gain powers through Terrigenesis via sci-fi crystals is a lot to introduce to the audience that didn't watch Agents of S.H.I.E.L.D. while also introducing mutants and multiverse shenanigans. Marvel Studios consistently defies expectations, at least with what's possible in a live-action shared universe. So, Inhumans could be also in the mix, but if so, why would the storytellers make their most famous Inhuman a mutant instead?
Unfortunately for the excellent Pasquesi, Mister Immortal is not likely to play a big role in future secret invasions or wars. The character was always something of a goof, and he was used to perfection on She-Hulk: Attorney at Law. Still, the implication that Mister Immortal has been immortal his entire life, suggests that he might be a mutant. This isn't important for his character, but rather for the MCU world-building this series does. This could mean that mutants have always been out there, just hiding better than they did in the comics. At least, "always" in the way that the past and the future changed when Loki broke the "sacred timeline." Maybe Mister Immortal fell into a vat of radioactive wrinkle cream, but the real secret invasion of the MCU might be from superpowered characters who are, in fact, mutants.
Of course, Mister Immortal might also just be a silly character based on an equally silly comics hero. This is definitely She-Hulk: Attorney at Law's M.O., lest audiences forget the Fabulous Frog-Man is coming. Still, it would be another Marvel Studios masterstroke to sneak a bunch of mutants into the stories fans already are watching for overt signs of any X-Men or even an appearance by Deadpool (Ryan Reynolds). The one way that Mister Immortal's actions could affect the larger story is as an example of how mutants pose a "danger" to society. The next time Pasquesi suits up as Mister Immortal, it might just be to be annihilated by a Sentinel.
While every MCU fan would rather binge all nine episodes of She-Hulk: Attorney at Law immediately, the week-by-week release is fun because it allows for these rampant moments of pure speculation. Is the nobody side-character a nobody or are they super-important? The only thing fans can be sure of, however, is that where She-Hulk is concerned every mystery will have the silliest answer possible.
See if any more down-low mutants pop up on She-Hulk: Attorney at Law when new episodes debut Thursdays on Disney+.