Tommy Trinder as Tommy Taylor

Frances Day as Poppaea

Sonnie Hale as The Professor

Francis L. Sullivan as Nero

Diana Decker as Lydia

Elisabeth Welch as Nora

Mary Clare as Volumnia

Ernest Milton as Titus

Frederick Piper as Auctioneer

Robert Wyndham as Lionkeeper

Russell Thorndike as High Priest

Danny Green as Lictor

James Robertson Justice as Centurion of the 8th Legion

Kay Kendall as Girl (uncredited)

Alec Mango as Secretary (uncredited)

Bill Shine as Minor Role (uncredited)

Julie Suedo as Señorita Àlvarez (uncredited)

Frank Tickle as Master of Ceremonies (uncredited)