Will Rogers

as Hank Martin

William Farnum

as King Arthur / Inventor

Frank Albertson

as Emile le Poulet / Clarence

Maureen O'Sullivan

as Alisande / Woman in Mansion

Brandon Hurst

as Merlin / Doctor in Mansion

Myrna Loy

as Queen Morgan le Fay / Evil Sister in Mansion

Mitchell Harris

as Sagramor / Butler in Mansion

Stanley Blystone

as King's Knight (uncredited)

Heinie Conklin

as Sneezing Man at Radio Station (uncredited)

Louise Emmons

as Old Hag in Dungeon (uncredited)