At Stalag 13, a German prisoner-of-war camp, Colonel Robert Hogan and his fellow cohorts are a subversive group with many hidden talents. However, a spy has been planted amongst the men by the Germans.
When Colonel Klink boasts that the Nazis' new Tiger Tank will lead the Germans to victory, Colonel Hogan devises a plan to get his hands on one of the vehicles, have it disassembled, send its blueprints to the Allies, and reassemble it --- right under Klink's nose.
A Secret rocket bomb developed by the Germans is being hidden at Stalag 13. When an Allied scientist is sent to photograph and sabotage the weapon, Hogan and his men plan a distraction — in the form of a bogus "Kommandant of the Year" ceremony for the clueless Colonel Klink.
To prevent Colonel Klink from being transferred to the Russian front, Hogan and his men attempt to convince a visiting Inspector General that the Colonel is a cold, heartless disciplinarian. But their plan backfires when, as a result, Klink is promoted to a post in Berlin!
Hogan's scheme to help a German baroness escape to London is thwarted by the arrival of a new prisoner of war, Colonel Crittendon, whose repeated, bungled attempts at escape are wreaking havoc on Hogan's mission to spirit away the baroness.
While on a sabotage caper, Hogan and Carter encounter a German general, overpower him, and smuggle him back to Stalag 13. Once there, they come up with a ploy to trick the disoriented general into revealing his troop's attack plans.
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!
What's inside a visiting German general's briefcase that's chained to his wrist? The mystery becomes too tempting for Hogan, who not only wants to photograph the case's contents, but then sneak the photos out of Stalag 13, as well!
When a heavily guarded "water" truck appears one day and is parked inside the camp, Hogan and his men decide to find out just what kind of cargo the vehicle actually contains.
Hogan's only chance to pass some important information off to an underground contact is via a rendezvous in a nearby village.
Sergeant Schultz, while escorting Newkirk to the dentist, gets drunk and is replaced by a hard-lined, no-nonsense guard. Hogan and his crew must act fast to get the docile Schultz restored to his post.
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.
When two ruthless German officers put the squeeze on Colonel Klink to contribute money to their phony cause "or else," Hogan and the gang must scramble to come up with the cash and deliver it in time to keep Klink out of harm's way as the camp's inept Kommandant.
The Germans' plan to build a synthetic fuel plant at Stalag 13 would spell disaster for Hogan's men and their important strategic subterfuge. So, Hogan attempts to convince Klink that there's a massive oil supply under the camp.
An agreement to aid two escapees quickly goes awry when 20 men show up at the appointed hour. Where will Hogan and his gang find uniforms and papers for the men? And how will they get them out of Stalag 13, with German guards stationed near the end of the secret escape tunnel?
When a British submarine cannot make a planned rendezvous to pick up a POW carrying an prototype of an important new German weapon, Hogan must come up with a sturdy, seaworthy replacement.
The British plan to bomb a strategic German beach on Hitler's birthday, unaware that a major gun placement is at the site and the Allied planes will be sitting ducks. Hogan and his crew must figure out how to silence the guns in order for the air raid to be a success.
A new prisoner reveals that a local bank nearby houses a shipment of gold stolen from the Bank of France by the Germans.
When Hogan informs London of an important German general’s imminent arrival at Stalag 13, he is told that he must detain the general at the camp for 24 hours—by whatever means necessary—so that Allied forces can stage a raid on the visiting general's forces.
Hogan is enthusiastic about joining forces with an underground unit that is targeting a local railway tunnel—unaware that the "saboteurs" are actually Gestapo agents masquerading as allies!
When LeBeau, Newkirk and Carter are captured by the Gestapo during a sabotage mission, Hogan must convince the affable Sergeant Schultz to impersonate the stern Colonel Klink and demand their release.
When an Italian POW camp commander arrives at Stalag 13 to train under Colonel Klink, Hogan and his gang try to convince the new arrival to go to work for the Allies.
Hogan's plan to destroy a mobile Nazi anti-aircraft battery is hampered by Colonel Klink's power-hungry peer, Major Kuehn.
The men of Stalag 13 are turned off by an American corporal's aloof attitude and boorish behavior, until they discover he has come to the camp to ask for help in carrying out a sabotage mission.
After a startling, deadly new German weapon (a secret, noiseless aircraft) has been brought to Stalag 13 for testing, Hogan's gang must do their best to tarnish its image.
Kinchloe dresses up as an African prince, whom Hogan has kidnapped, in order to ask the Germans for money to open a submarine base. Complications arise when the prince's wife arrives.
Colonel Klink's happy reunion with an old military buddy ends abruptly when the man is arrested by the Gestapo. Will Klink end up in the clink as well?
The men of Stalag 13 have no interest in tunneling into a neighboring barracks that houses new prisoners—until they discover that the new detainees are women!
An important German nuclear scientist must be eliminated and Hogan's crew is asked to perform the task—a plan that takes an unexpected twist when the scientist comes to Hogan and asks for help fleeing the Nazi regime.
Colonel Klink is desperate after General Burkhalter plays matchmaker and pairs Klink with the general's sister, Gertude. Can Hogan deflect some of the Cupid's flying arrows away for the hapless, helpless Klink?
Somewhere along the elaborate, intricate underground escape route there is a disastrous weak link. Determined to find it, Hogan, Newkirk and Lebeau decide to break out of Stalag 13 by following the escape route themselves.
Jilted by his girlfriend back home, Carter requests permission to escape so that he can somehow woo her back. Hogan agrees, but only if Carter can accomplish one last task of passing bogus battle plans on to the Germans.
