Jason IsaacsStar Trek: Discovery" series as its captain. The "Harry Potter" alum will play Captain Lorca, who commands the Starship Discovery, according to THR.

Already announced for the CBS All Access series are Sonequa Martin-Green (Sasha on "The Walking Dead") as lead lieutenant commander, James Frain as Spock's father Sarek, Anthony Rapp ("Rent") as a space fungus expert, and Michelle Yeoh as the captain of the Starship Shenzhou.

Isaacs' other sci-fi credits include "The OA," although he's probably best known for playing villainous Lucius Malfoy in the "Harry Potter" films.

The latest "Star Trek" series was originally set to launch the CBS streaming service in January, but will now debut late this summer or fall, THR reports.

One of the reasons for the delay: "Hannibal" producer Bryan Fuller stepped down as showrunner. He stays on as an executive producer.

CBS's Les Moonves told investors that another reason for the later release date is the amount of post-production required. "It's important to get it right, and 'Star Trek' is the family jewels," Moonves said at a recent conference.

"There are millions and millions of Trekkies out there," Moonves said, ignoring the preferred fandom term of "Trekkers." "We know for a fact that the other versions of 'Star Trek' — there were seven other series, some of them were great and some of them were terrible — they all did really well on Netflix. That gave us great confidence that this was the right choice to put the full court press on 'All Access.'"