Legion has found its Professor X for final season

The story of David Haller (Dan Stevens) and his tortured minds is gearing up for its conclusion with the upcoming third season of Legion. And after a day full of big Legion news, the show has capped it off with some major casting additions for its final eight episodes.

According to the show's official Twitter account, David's parents have been cast. His mother, Gabrielle, will be played by Stephanie Corneliussen (Mr. Robot, Legends of Tomorrow). Harry Lloyd (Viserys Targaryen on Game of Thrones) will play his father, Charles. Who's better known by his moniker, Professor X.

While Legion has always been a part of the larger X-Men cinematic universe, its story was self-contained, and only referenced the fact that David was related to Professor X.

Having Harry Lloyd, who also appears on the Starz sci-fi/espionage thriller Counterpart, cast as Charles Xavier is a major breakaway for the show. The role was initially played by Patrick Stewart in the first few X-Men films; then James McAvoy played the younger version starting in X-Men: First Class. Both appeared in the time-traveling installment X-Men: Days of Future Past.

Earlier today, showrunner Noah Hawley said that the first season will be about David's reckoning with his actions in Season 2, as well as his personal limitations because his "ego is fragile." Having dear old dad around — and all his psychokinetic powers — will likely make things quite a bit more complicated.

The third season of Legion will premiere on FX sometime this June.