Smallville alum Sam Witwer joins Supergirl season 4 as Agent Liberty 

Melissa Benoist, Mehcad Brooks, David Harewood

season 8 as Doomsday, has joined the CW superhero drama’s upcoming fourth season in the series regular role of DC Comics character Agent Liberty.

In the show’s interpretation on the character, Agent Liberty is the ruthless and terrifying founder and figurehead of Children of Liberty, a hate group that supports a human-first world order. According to a description from the show’s producers, he’s “a brilliant orator in the guise of a family man” and the scariest thing about him is how easily he can convince people that he’s right. Given that Supergirl (Melissa Benoist) and the DEO tend to be pro-alien integration, it’s definitely fair to assume they won’t get along with Agent Liberty and his Children of Liberty.

alum to appear on the show. Erica Durance, who played Lois Lane for seven seasons, recurs as Kara’s mother Alura Zor-El, and Laura Vandervoort, who played Supergirl on 

has undergone several cast changes. Series regular Chris Wood and Jeremy Jordan both left the series at the end of season 3; however, Jordan is expected to recur in the new season. Meanwhile, Jesse Rath, who stars as Brainiac 5, was promoted to series regular for season 4.