Hogan must get a U.S. general out of camp, Klink's plans to move the fence line, and Gertrude's arrival with her fiancé (that she would make Stalag 13's adjutant.)
The guys find a new rocket that has landed near camp. They are at a loss on how to get it back to England for study when Marya and her rocket-designing husband enter camp.
Klink is appointed defense counsel for a German officer on trial for treason who has secret plans intended for London. Hogan helps Klink prove the officer's innocence in order to secure the plans.
Hogan arranges for a beautiful Russian spy to convince Klink that the Kommandant should volunteer for service at the Russian front. Hogan's payoff: some secret papers.
In an effort to transport a German anti-radar unit to London, Hogan passes LeBeau off as a fortune teller after convincing Klink he was struck by lightning.