Plot details were not revealed, but sources tell The Hollywood Reporter that Perlman will play a goblin.

THR earlier this week revealed that Humans star Gemma Chan, Selma actress Carmen Ejogo and Jon Voight recently joined the cast.

Also on the roll call: Katherine Waterston, Ezra Miller, Colin Farrell, Dan Fogler and Samantha Morton.

Perlman starred in all but the last season of FX’s Sons of Anarchy and also starred in the recent Amazon series Hand of God. The fan-favorite actor, known for starring in the Hellboy movies, was most recently seen in Roland Emmerich’s civil rights drama Stonewall.

He is repped by Gersh and LINK Entertainment.