American pilot Peter Hawkins (Jess Hahn) is shot down over occupied Italy by an incompetent group of Nazi soldiers. He is rescued by a group of priests and is befriend by the feisty Rita (Rita Pavone) and an absent minded professor, Giuliano (Terence Hill). It turns out that the professor has created a rocket which will make rain. The Nazi's are determined to have this creation for themselves and the unlikely trio of Giuliano, Rita and Peter begin a cross country trek, always one step ahead of their enemies.
Happily for Terence fans, his role in this is greater than Little Rita. The professor is dozy but kind, he wants to spend his days working on his inventions but frequently has his plans waylaid by Rita. Initially they resent one another, but eventually romance blossoms. The trio are forced to impersonate Nazi's with often hilarious results.
Bizarrely there is even a Beatles spoof at the end of the film!
For anyone interested in watching this film the company, 'Cheezy Flicks', has a copy released on DVD. It is not perfect (there are a couple of song sequences missing), but this does not hinder the basic plot or the enjoyment of this crazy picture!