So what is 143? That title doesn’t deliver a ton of info, but the history of the X-Men franchise may offer a clue. In X2: X-Men United, audiences are introduced to Jason Stryker – the mutant son of William Stryker (Danny Huston) who has the power to invade people’s minds. The powers are very similar to the X-Men comics character Mastermind, but he is also referred to as Mutant 143. Does that mean that this project could be about him?