Several attempts by Hogan and his men to destroy a German bridge end in failure—until they decide to use the Nazis' own ammo to accomplish the task!

LeBeau aids in the escape of a captured French scientist and his daughter, who are able to make it out of Germany. But now the men of Stalag 13 must find a suitable "replacement" scientist who can present and discuss the study's findings.

Hogan must somehow get himself hospitalized so that he can get top-secret information from a wounded British agent who has been posing as a Nazi officer.

Hogan tries to save Klink from the officer who wants to turn him in for his lousy bookkeeping skills.

The heroes try to prevent the Gestapo from sending Klink and Schultz to the Russian front.