The Sentinels are certainly villainous, but they are the muscle for a higher operation. One of our recent articles here on WhatCulture explored the villains wed love to see in the new film, and good money should probably be put on a couple members of that list. Certainly Magneto and Mystique are bound to be up to their radical activist shenanigans, but in this story, its mutants versus the world. Considering Singers strong use of William Stryker in X2, it really shouldnt come as any surprise if we hear that Bolivar Trask, the creator of the Sentinels, would be a main adversary. In many ways, Trasks involvement would be pretty reflective of Strykers in solving the mutant problem through containment and extermination, although Trasks motivations will likely be a bit different than Stryker's whole vengeance scheme. Its also possible we could get an appearance from Master Mold, the lead sentinel that creates all the others. If Singer really wanted to mix things up though, it would be a real treat to finally see Mr. Sinister bring his scientific madness to the silver screen, and he could probably sell us on Sinister being behind the Sentinels as a lead up to a future appearance by Apocalypse. That's quite a bit of planning ahead, though, and no need to drum up excitement now for an Age of Apocalypse movie that may never happen.