Chris Pepper and Charlie Salt lose their nightclub and turn to Pepper's aristocratic twin brother for help. He refuses to help them, and is then found murdered. Pepper assumes his identity, and soon discovers that he was a diamond smuggler, and was murdered by his accomplices. Salt and Pepper band together to put the criminals behind bars.

• Sammy Davis Jr. as Charles Salt
• Peter Lawford as Christopher Pepper / Lord Sydney Pepper
• Maggie Wright as Miss Tomkins
• Ester Anderson as Billie
• John Wood as Figg
• Dudley Sutton as Wilson
• Percy Herbert as Mander
• Anthony Nicholls as Candler
• Allan Cuthbertson as Belton
• Edward Evans as Gordon
• Leslie Sands as Inspector Glock
• Glyn Owen as Dennis
• Peter Cushing as Baron Frankenstein
• Christopher Lee as The Vampire
• Jerry Lewis as Bandleader (voice)

One More Time is the only film that Jerry Lewis directed in which he did not star, although he does have a role as the off-screen voice of the bandleader.

The film was released on DVD on January 25, 2005.

Slightly before the release of the film, per the era's customary timing, a novelization of the screenplay was released by Popular Library. The author was Michael Avallone.

• List of American films of 1970

• One More Time at IMDb  
• One More Time at AllMovie