Deadline is reporting that Ulrich Thomsen (Counterpart, The Blacklist) has been cast as the iconic villain Sinestro in DC’s Green Lantern television series Lanterns, joining an already stacked cast.

Here’s how it works. Introduced in 1961’s Green Lantern #7, Sinestro was once a member of the Green Lantern Corps who trained Hal Jordan how to wield the emerald light of willpower.