Mark Mclure & Annette O'Toole was brought on to reprise their role from Superman 3 and Eric Stolz was brought in as Quinn , Supergirls love intrest who is hiding his own secret
- Brooke Shields as Kara Zor-El / Linda Lee / Supergirl
- Faye Dunaway as Grace Manheim
- Christopher Reeve as Superman/ Clark Kent
- Peter O'Toole as Virl Dox
- Eric Stolz as Quinn/ Brainiac 5
- Mia Farrow as Alura In-Ze
- Brenda Vaccaro as Bianca
- Peter Cook as Nigel
- Simon Ward as Zor-El
- Marc McClure as Jimmy Olsen
- Annette O'Toole as Lana Lang
- Mary Lou Retton as Lucy Lane
- David Healy as Mr. Danvers
- Frank Welker as Tel-Var (voice)
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