What actors and actresses appeared in Gu - 1981?

You're likely referring to the 1981 film "G" (also known as "G - The Movie").

Here are the main actors and actresses in the film:

* Michael Greer as George "G" Gorman

* Brooke Adams as Alice Gorman

* Susan Sullivan as Mrs. Gorman

* David Spielberg as Mr. Gorman

* Jeffrey Tambor as Max

* Jack Kruschen as Harry

Please note: The film was controversial and received mixed reviews. It's known for its unique storytelling and explores themes of obsession, manipulation, and identity.