Upcoming series "Star Trek: Discovery" won't make its planned May debut date, as reported Wednesday by multiple outlets including THR. A new time frame for its premiere has not yet been announced. This news arrives alongside the latest casting for the show, with James Frain official as Sarek, Spock's father.

"Production on 'Star Trek: Discovery' begins next week," CBS All Access said in a statement. "We love the cast, the scripts and are excited about the world the producers have created. This is an ambitious project; we will be flexible on a launch date if it's best for the show. We've said from the beginning it's more important to do this right than to do it fast. There is also added flexibility presenting on CBS All Access, which isn't beholden to seasonal premieres or launch windows."

Frain is a TV and film veteran, with past credits including "The Tudors," "Orphan Black," "Tron: Legacy," "True Blood" and a recent stint on "Gotham" as Theo Galavan/Azrael. Sarek has appeared in multiple iterations of the Star Trek franchise, dating back to the original series, where the role was played by Mark Lenard.

This is the second delay for "Discovery," which was originally intended to premiere this month. The show was first announced in November 2015. "Pushing Daisies" and "Hannibal" veteran Bryan Fuller co-created the series with franchise vet Alex Kurtzman, but left the show last fall.

"Star Trek: Discovery" will first debut on CBS, and then move to the network's streaming service, CBS All Access, for its 13-episode first season. Along with Frain, cast members include Sonequa Martin-Green, Doug Jones and Anthony Rapp.