Ambrose C. Park, left on a park bench as an infant with an impulsive need to find his parents, is an assistant to a diamond cutter. Shyster lawyer Remlick, in a strategy to get a fabulous uncut diamond through Ambrose, arranges for Emily Drummon, Duke Fargoh and Maggie Drummon to pose as Ambrose's long-lost parents and sister. The diamond, through many comic situations, is acquired and the gang is going to have Ambrose cut the diamond, and relieve him of the two stones and his parental illusions at the same time. But Maggie, who has no taste for the deception, tips Ambrose off and a wild chase ensues. At the end, Ambrose is very happy as he can now marry his "sister."
Red Skelton
as Ambrose C. Park
Cara Williams
as Maggie Drumman
James Whitmore
as Mr. Remlick, Lawyer
Kurt Kasznar
as Louie
Dorothy Stickney
as Emily Drumman
George Mathews
as Duke Fargoh
Reginald Owen
as Bainbridge Gibbons
Harry Bellaver
as Herb
Connie Gilchrist
as Blonde
Steven Geray
as Van Goosen
Sig Arno
as Mr. Sahutsky
G. Pat Collins
as Nightwatchman Connelly (uncredited)
