Will Rogers

Hank Martin

William Farnum

King Arthur / Inventor

Frank Albertson

Emile le Poulet / Clarence

Maureen O'Sullivan

Alisande / Woman in Mansion

Brandon Hurst

Merlin / Doctor in Mansion

Myrna Loy

Queen Morgan le Fay / Evil Sister in Mansion

Mitchell Harris

Sagramor / Butler in Mansion

Stanley Blystone

King's Knight (uncredited)

Heinie Conklin

Sneezing Man at Radio Station (uncredited)

Louise Emmons

Old Hag in Dungeon (uncredited)