During the latter part of World War I, Private Charles Plumpick is chosen to go into the French town of Marville and disconnect a bomb that the German army has planted. However, Charles is chased by some Germans and finds himself holed up at the local insane asylum, where the inmates are convinced that he is the "King of Hearts." Feeling obligated to help the inmates, Charles attempts to lead them out of town, but they are afraid to leave and frolic about the streets in gay costumes. Will Charles be able to deactivate the bomb in time and save his newfound friends?
Jean-Claude Brialy....Le Duc de Trèfle
Adolfo Celi....Le Colonel Alexander MacBibenbrook
Julien Guiomar....Monseigneur Marguerite
Micheline Presle....Madame Eva alias Madame Eglantine
Michel Serrault....Monsieur Marcel
Jacques Balutin....Mac Fish
Pier Paolo Capponi....Un officier anglais (as Paolo Capponi)
Marc Dudicourt....Le Lieutenant Hamburger
Filmography links and data courtesy of The Internet Movie Database.