“The Flash” has cast Victor Garber in the recurring role of comic book character Dr. Martin Stein, The CW announced Thursday.

As one half of the Firestorm entity in the DC Comics universe, Martin Stein is described as a brilliant but arrogant nuclear physicist who has sacrificed everything, including a marriage, for his work in transmutation. After he discovers the particle accelerator fused him with the younger, more impulsive Ronnie Raymond (Robbie Amell), he races to find a way to separate the two before it’s too late. Garber will first appear in episode 112.

“The Flash” star Grant Gustin shared his excitement about the casting over Twitter:

The actor is the latest in a string of notable casting announcements for “The Flash,” which recently tapped “Prison Break” stars Wentworth Miller and Dominic Purcell to guest star as villains Captain Cold and Heat Wave, respectively. Also joining the show are Kelly Frye as Bette Sans Souci, alter ego of Plastique, and original “Flash” star Amanda Pays to reprise her ’90s role as Dr. Tina McGee. “The Flash” got off to a speedy start on Tuesday, giving the CW its best ratings for a premiere in five years with a 1.8 rating/6 share in adults 18-49 and 4.5 million viewers overall.

A genre TV favorite for his work on “Alias,” Garber recurs on Showtime’s “Web Therapy” and Starz’s “Power” and has recently made guest appearances on “Sleepy Hollow,” “Louie” and “The Good Wife.” Garber is represented by Bill Butler at Industry Entertainment and UTA.