June's Space Babe is Kirstie Alley as the half-Vulcan/half-Romulan Lieutenant Saavik in 1982's Star Trek II: The Wrath Of Khan. One of the most memorable later additions to the original Star Trek canon, Lt. Saavik was introduced as the protégé of Captain Spock, who presumably identified (if not empathized) with her dual heritage. Fresh from the Academy and eager to prover herself, Saavik was instrumental in the defeat of the 20th Century genetic warlord Khan... and then she was replaced by another actress (Robin Curtis) in the next two Trek features.

Although she had appeared uncredited in an episode of Quark as a nameless handmaiden (at least, according to the IMDb - I have to go check that out myself when I get a moment), it was Star Trek II that launched the lovely Ms. Alley into a long and successful acting career that continues today. After Khan, she appeared in a number of TV episodes, miniseries and features until landing a co-starring role on the popular sitcom, Cheers. Reportedly afraid of being typecast, she declined to return to the role of Saavik in subsequent Trek features.