^I don't know if this is the original blurb, but the description on TV Guide
's website now is:
Kirk's investigation of an energy force takes him to a planet where he encounters Lazarus (Robert Brown), who is actually two people---one sane, one insane---from parallel universes. Barstow: Richard Derr. Lt. Charlene Master: Janet McLaghien [sic]. Kirk: William Shatner. Spock: Leonard Nimoy. Uhura: Nichelle Nichols.