Kaina is from the planet Contraxia. She was one of two sent to Earth to try and discover a method to save the star of their system. She would study physics under the alias Marcy Kane while the other would become involved with the Earthling Phillip Hart. Calling herself Marie, she and Phillip would have a son named Jack Hart.
Marcy Kane was created by Bill Mantlo and Jim Mooney and first appeared in The Spectacular Spider-Man Vol.1 issue 32 (1979). Her true heritage was only explained in the Jack of Hearts mini-series from 1984.
Major Story Arcs
Finding her Son and Peter Parker
While attending New Haven College in Connecticut, Marcy formed a bond with her son Jack Hart, without telling him she was his mother. But after Jack was involved in an accident that changed him into the Jack of Hearts, he never told her or returned to her. Marcy Kane became a college friend while she was an undergraduate at Empire State University to Peter Parker. They dated at times.
Marcy would eventually reunite with Jack and she would take him to Contraxia and tell him of his heritage. With his powers he was able to restore their sun, but would leave to roam space instead of staying there.