Suggestions by @irishgypsy98

Fred Astaire

as Yekop in Maltusians

Doris Day

as Valorex in Maltusians

Henry Fonda

as Rami in Maltusians

James Dean

as Quaros in Maltusians

Gary Cooper

as Pazu Pinder Pol in Maltusians

Gene Kelly

as Paalko in Maltusians

Marlon Brando

as Gurion in Maltusians

Elizabeth Taylor

as Zalla in Maltusians

Katherine Hepburn

as Scar in Maltusians

Greta Garbo

as Sayd in Maltusians

John Wayne

as Krona in Maltusians

Errol Flynn

as Herupa Hando Hu in Maltusians

Robert Mitchum

as Ganthet in Maltusians

Clark Gable

as Dawlakispokpok in Maltusians

James Cagney

as Appa Ali Apsa in Maltusians