Harry Lloyd and Stephanie Corneliussen have been cast as Professor X and Gabrielle, respectively, in FX's Legion. As in the comic books, these two characters will be the parents of the lead character, David Haller (played by Dan Stevens).
Lloyd is well-known for playing Viserys Targaryen in HBO's Game of Thrones, and previously appeared in BBC's Robin Hood and Doctor Who.
Corneliussen played Valentina Vostok in CW's DC's Legends of Tomorrow, and has had a featured role on USA Network's Mr. Robot.
The third and final season of Legion is scheduled to debut in June.