premise: Buffy Summers has been portrayed only by Kristy Swanson.
hypothesis: Buffy Summers . Buffy was portrayed by Kristy Swanson in the film , and later by Sarah Michelle Gellar in the television series . Giselle Loren has lent her voice to the character in both the Buffy video games and an unproduced animated series , while Kelly Albanese lent her voice to the character in the Buffy the Vampire Slayer Season Eight motion comics .