MGM was never quite sure what to do with their resident funster Red Skelton, and The Great Diamond Robbery betrays this uncertainty. Skelton plays Ambrose C. Park, a diamond cutter who is led to believe that he's the long-lost heir to a fortune. Actually, Ambrose has been duped by shyster lawyer Remlick (James Whitmore), who is in cahoots with criminal mastermind Louie (Kurt Kaznar). Convinced that he's being a dutiful nephew, Ambrose helps the crooks steal a valuable diamond, then agrees to cut the jewel himself. There's way too much plot and not enough Skelton in this 69-minute programmer, but Red manages to collect a few loose chuckles along the way. Great Diamond Robbery leading lady Cara Williams was later more memorably teamed with Skelton in the 1962 TV special "Freddie and the Yuletide Doll."
by Hal Erickson synopsis