A British commando team heads into France to blow up a German-held dam in preparation for D-Day, while a British agent infiltrates the German garrison to give inside help. The twist is that the British officer is replacing his twin German brother.
| Actor | Role |
|---|---|
 Richard HarrisonLt. Richard Benson / Lt. Hans Müller | Lt. Richard Benson / Lt. Hans Müller |
 Klaus KinskiCaptain Holtz | Captain Holtz |
 Giacomo Rossi StuartMajor Powell | Major Powell |
 Frank BrañaFrançois Leduc | François Leduc |
 Pilar VelázquezElise | Elise |
 Helga LinéMarlene Schulman | Marlene Schulman |
 Antonio Casas"La Tulipe" | "La Tulipe" |