Before he begins filming season two of his Golden Globe-nominated “Casual” in February, Birmingham’s Tommy Dewey has another high-profile gig on the small screen.

Beginning tonight at 9, he joins the cast of CBS’ “Code Black” for a multi-episode arc that he says has been a “blast” to film.

Birmingham’s Tommy Dewey, left, and Benjamin Hollingsworth in an episode of CBS’ “Code Black.” (CBS photo/Jessica Brooks)

“I play Dr. Mike Leighton, an ‘all-star’ ER doctor who returns to the hospital where he cut his teeth as a resident, and where his younger brother is currently a resident,” says Dewey, who graduated from Mountain Brook High School and Princeton University. “Mike is dry-witted but intense, and he doesn’t back down from challenging the residents (including his brother) now in his charge.”

Dewey, who stars as Alex in the Hulu comedy “Casual” and whose other TV work includes “The Mountain,” “Sons of Tucson” and “The Mindy Project,” calls “Code Black” a “pulls-no-punches emergency room drama.”

“While it focuses on the complex personal dynamics, rivalries and politics in this high-stakes world, (it) also goes to great lengths to get the medicine right,” Dewey says. “We work with real doctors and nurses to prepare for each episode.”

The show’s stars include Marcia Gay Harden, Harry Ford, Raza Jaffrey, Bonnie Somerville, Melanie Chandra, Jillian Murray, Ben Hollingsworth, Boris Kodjoe, Luis Guzman and Angela Relucio.