"Kilroy Was Here" was a popular expression during World War II, but it's not much fun to John J. Kilroy, who has to try to live with all the jokes and wisecracks regarding his name.

Jackie Cooper
as John J. Kilroy

Jackie Coogan
as Pappy Collins

Wanda McKay
as Connie Harcourt

Frank Jenks
as Butch Miller

Norman Phillips Jr.
as Elmer Hatch

Rand Brooks
as Rodney Meadows

Barton Yarborough
as Prof. Thomas Sheperd

Frank J. Scannell
as 1st Cab Driver (as Frank Scannell)

Patti Brill
as Marge Connors

Robert Coogan
as Soldier Cheer Leader