Credit: Jamie McCarthy/WireImage

The Westworld population keeps growing: You can now add X-Men franchise actor James Marsden to the pilot’s cast.

Marsden (Lee Daniels’ The Butler, Anchorman 2) has joined the HBO sci-fi drama about a futuristic theme park filled with android residents that fulfill human desires. The actor will play Teddy Flood, who is described as “a mysterious new arrival to a small frontier town. Teddy quickly proves both his charm—and his talent with a revolver. His pursuit of a local beauty launches him on a dark odyssey.”

But wait, there’s more: Westworld has also booked Eddie Rouse (Being Flynn), Demetrius Grosse (Justified), Kyle Bornheimer (She’s Out of My League), Currie Graham (Murder in the First), Lena Georgas (Prime Suspect), Steven Ogg (Grand Theft Auto V), and Timothy Lee DePriest.

The actors join an already significant ensemble cast headed by Anthony Hopkins and Evan Rachel Wood. Earlier this week the series added more actors with credits that include Fox’s Raising Hope and The Hunger Games franchise.