In “Lethe,” the sixth episode of Star Trek: Discovery, everyone has something to hide. But the character with the biggest secret is easily Spock and Burnham’s dad, the famous Vulcan ambassador, Sarek.

EXCLUSIVE: James Frain (Gotham, True Blood) and Eliza Scanlen (The Dope Girls, The Starling Girl) have been cast as new series regulars opposite Alexandra Daddario for the third season of Anne Rice’s ...