sentences:  They are from an alternate dimension and were brought to the mainstream Marvel dimension during the events of Decimation.The Shadow King took control of the Professor Xavier of their reality and then was able to subvert all of the X-Men to serve him.When they were brought to Earth-616 the Dark Professor Xavier tried to bring Nocturne, Marvel Girl, and Shadowcat under his control, but he was defeated by them, with help from Sage, and later placed in Crossmore prison.