"Star Trek: Discovery" has added a trio of Klingons to its rapidly expanding cast.

Deadline reports the CBS television revival has tapped "Penny Dreadful" alum Shazad Latif for the prominent role of Klingon commanding officer Kol, with Chris Obi ("American Gods") playing T’Kuvma, a Klingon leader who seeks to unite the Klingon houses. Mary Chieffo will portray L'Rell, the battle deck commander of the Klingon ship.

They join a previously announced cast that includes Michelle Yeoh as Starfleet Captain Georgiou, Doug Jones as Science Officer Lt. Saru and Anthony Rapp as astromycologist Lt. Stamets. The series lead has yet to be cast.

Set a decade after the events of the original "Star Trek," the series centers on the crew of the Starfleet vessel the U.S.S. Discovery. The season-long storyline will focus on an event from the franchise's mythology that's been mentioned but never explored.

Bryan Fuller, who began his professional career on “Star Trek: Deep Space Nine” and “Star Trek: Voyager," was originally hired as a showrunner, but his obligations to Starz's "American Gods" led first to a delay in the premiere of "Discovery" and then to his departure from the series.

“It is bittersweet,” he recently said. “But it was just a situation that couldn’t be resolved otherwise … so I had to step away.”

Set construction is expected to be complete within the month, with filming of the 13-episode first season targeted to begin soon after at Pinewood Toronto Studios.