Bud Abbott as Lester

Lou Costello as Orville

Mari Blanchard as Allura

Robert Paige as Dr. Wilson

Horace McMahon as Mugsy

Martha Hyer as Janie Howe

Jack Kruschen as Harry

Joe Kirk as Dr. Orvilla

Jean Willes as Capt. Olivia

Anita Ekberg as Venusian Guard

James Flavin as First Policeman in Bank

Jackie Loughery as Venusian Guard

Ruth Hampton as Handmaiden (as Ruth June Hampton) (as Miss New Jersey)

Valerie Jackson as Handmaiden (as Miss Montana)

Renate Hoy as Handmaiden (as Renate Huy) (as Miss Germany)

Jeanne Thompson as Handmaiden (as Miss Louisiana)

Jeri Miller as Venusian Guard

Elsa Edsman as Handmaiden (as Elza Edsman) (as Miss Hawaii)

Judy Jorell as Venusian Guard (as Miss MIchigan)

Hal Forrest as Dr. Nedring (uncredited)

Jack Tesler as Dr. Holtz (uncredited)

Russ Conway as Second Policeman in Bank (uncredited)

Syd Saylor as Man at Fountain (uncredited)

Patti McKaye as Venusian Guard (uncredited)

Harry Shearer as Second Boy (uncredited)

Harold Goodwin as Dr. Coleman (uncredited)

Robert Stevenson as Observer (uncredited)