Guest Stars James Doohan as Lt. Cmdr. Montgomery "Scotty" Scott George Takei as Lt. Hikaru Sulu Walter Koenig as Ensign Pavel Chekov Majel Barrett Roddenberry as Nurse Christine Chapel Charles Napier as Adam Skip Homeier as Sevrin Mary Linda Rapelye as Irina Co Starring Elizabeth Rogers as Lt. Palmer Phyllis Douglas as Girl #2 Victor Brandt as Tongo Rad Deborah Downey as Girl #1 Uncredited James Drake as Sick-Bay Intern