Yvonne Craig is forever Batgirl. There’s no denying the actress, who died of cancer at her Southern California home on Monday at 78, was best known as the crime-fighting sidekick of Adam West’s Caped Crusader in the campy 1960s Batman series. But her résumé stretched beyond Gotham City: She twice played Elvis Presley’s girlfriend on the big screen; she appeared on the original Man From U.N.C.L.E. TV series; and, in later years, she made the requisite trip to Fantasy Island.

But Craig will always be held in high regard by fans of the original Star Trek for her memorable guest role as an alluring green alien who tries alternately to seduce and eviscerate Captain Kirk.

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In the 1969 episode “Whom Gods Destroy,” Craig makes a memorable entrance as Marta, a slave from the planet Orion versed in Shakespeare.

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A ballerina by training, Craig then performs an entrancing, athletic dance that catches the eye of William Shatner’s Kirk.

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Marta later retires to Kirk’s bedroom where her initial advances turn homicidal, as she has a dagger stashed under the pillow. Fortunately for Kirk, Spock (Leonard Nimoy) arrives just in time and Marta winds up on the business end of a Vulcan nerve pinch.

By episode’s end, Marta is caught in an explosion and killed.