A beautiful woman - Supergirl Francesca Farnese (Iris Berben) - appears out of nowhere on a Bavarian highway. She wears only an orange jumpsuit and wants to go to Washington. Playboy Charly (Nikolas Dutsch) first takes her to Lake Starnberg, where she meets best-selling author Evers (Marquard Bohm). He immediately leaves his wife and travels with Francesca to Spain, where he negotiates a project with the American film producer Polonsky.
No one remains unimpressed by the mysterious beauty. Supergirl remains elusive - she quickly disappears again, leaving behind a warning to the inhabitants of Earth that an attack from outer space is imminent...
Rudolf Thome's third feature film was commissioned by WDR in 1970. It was shot with stars Iris Berben and Marquard Bohm in Bavaria, Sète, Paris and Madrid. Rainer Werner Fassbinder, Klaus Lemke and Eddie Constantine made guest appearances.
In 2013, Supergirl was digitally restored with the support of the FFA.