Nameless Dimension where Lucifer has been imprisoned since one of his last attacks on Earth, the Nameless Dimension being a strange void full of 'liquid' that Xavier and Lucifer can breathe as though it is still oxygen. Lucifer intends to use the duplicate Xavier to retrieve key devices from other Quistalium outposts on Earth that can be used to modify the equipment that transferred Xavier to the Nameless Dimension, reconfiguring it so that Lucifer will be able to escape back into this world, assigning that task to the original five X-Men while claiming that the device is to be used as part of a machine that 'Xavier' has created to protect Earth from future invasion. Xavier is able to telepathically reach beyond the Nameless Dimension back to Earth, but cannot contact the X-Men as his telepathic powers are too weak to make contact with them amid their complex thoughts across the dimensional barrier. Fortunately, Xavier is able to contact Jeffrey Saunders, Jeremiah's grandson, who possesses a brain defect that hampers his ability to process information, Jeffrey's physically superior body allowing Xavier to travel to the mansion and expose his duplicate as a fake. With the X-Men alerted to Lucifer's deception, they are able to use the equipment to retrieve Xavier from the Nameless Dimension before destroying it, trapping Lucifer all over again. In the X-Men/Star Trek crossover novel Planet X, Archangel and Beverly Crusher program a copy of Professor X into the holodeck of the Enterprise-E based on Archangel's own knowledge of the professor and information the Enterprise downloaded from the Xavier Mansion's computers during their visit to the Marvel Universe. Crusher privately reflects that Professor X and Captain Picard look surprisingly similar, with the two sharing the same thoughts when they later meet. Accepting his status as a hologram of himself, Xavier assists Doctor Crusher in developing a cure for the 'transformed', a group of artificially-created mutants on a planet that the Enterprise is visiting. In a later meeting with Picard, Xavier invites the captain to return and speak with him in the future if his personality will remain in the holodecks after the current crisis has been resolved, Picard assuring the Professor that he would be honoured to do so as he compliments Xavier's success in bringing the X-Men together given their diverse personalities and powers. The Chaos Engine trilogy sees Xavier and a team of X-Men become