The exploits of five World War II prisoners in a German POW camp, 'Stalag 13' who, while "under the cover" of being typical prisoners of war, are really secretly doing their utmost to sabotage the German war effort through whatever means necessary. Col. Klink is very proud that no prisoner has ever escaped under his watch, not that they would want to. Suave, cool and smart, Col. Hogan takes advantage of Col. Klink and Sgt. Schultz's bravado and general cluelessness to carry out his missions.
Colonel Hogan is called on to destroy a German convoy inside a tunnel --- but he balks when he discovers that his accomplice will be his old adversary, Colonel Crittendon.
The Germans' plan to shoot down British bombers by using captured RAF airplanes is uncovered, and Hogan and his men must attempt to destroy the aircraft before they can be flown on their deadly, deceptive mission.
Hogan and his men play a part in the D-Day invasion of France when they are asked to create a diversion that will delay Colonel Klink and other German officials at Stalag 13 from retaliating once the invasion is underway.
Sergent Schultz falls head over heels for an attractive woman --- but Hogan suspects that she is a Gestapo agent and has Carter shadow the two loverbirds on one of their dates.
Newkirk, Kinchloe and LeBeau must help Hogan fool the Germans with a look-alike German official to thwart the Nazis' planned assassination plot against British Prime Minister Winston Churchill.
Klink's new secretary Gertude Linkmeyer decides to throw herself into the task of completely organizing the commandant's workplace --- an all-night project that throws a monkey wrench into Hogan's mission of raiding the safe in Klink's office.
A famed scientist is recruited by the Germans to develop a revolutionary new metal alloy for the Nazi war machine --- so Hogan and the gang must distract the doctor --- or worse --- to keep him from accomplishing his task.
Hogan must somehow deliver a shipment of bulletproof vests to the French underground --- and a captured French Resistance fighter seems to be the perfect candidate to help Hogan pull of the caper.
Stalag 13 becomes the site for a German counterfeiting factory that will produce both American and British currencies. But Sergeant Schultz's sticky fingers inadvertently tip Hogan off to the scheme when Schultzy spends some of the "funny money" gambling at the prisoners' casino.
When Hogan and his men set out to destroy the Germans' new S-5 gun that's being guarded at Stalag 13, they uncover more then they bargained for --- a traitor amongst their ranks who has gone to Colonel Klink to report on Hogan's planned sabotage.
Paris is targeted for destruction should the Allied armies invade, so Hogan and Kinchloe secretly travel to the French capital to learn more about the plot --- and end up seeking help in their caper form an exotic dancer/ medium named Kumasa.
Hogan and his men face the difficult task of returning a Soviet pilot to his homeland --- especially when the fanatical, demanding Russian refuses to follow the usual escape route to England.
Hogan and his men have cleverly rigged the tabletop centerpieces to explode during a banquet for Germany's top generals --- unaware the one of the guests at the banquets is an invaluable spy working undercover for the Allies.
An American military captain and his crew hiding out at Stalag 13 face capture when Major Hochstetter and his search party zero in on the POW camp --- and its elaborate tunnel system to freedom is threatened with exposure.
A rocket fuel depot that the Germans build near Stalag 13 is a tempting target for Hogan and his men. But is the new facility just part of a plan to lure Hogan into a trap?
To get the inside secrets of a Nazi chemical warfare facility, Hogan and his cohorts must convince the Germans that Carter has turned traitor and wishes to defect to the Third Reich.
Hogan's surreptitious operation --- as well as secret information on America's atom bomb project --- is threatened when it's discovers that a top Gestapo official knows all about Hogan's espionage activities and plans to offer him a deal.
Colonel Klink's sudden bout with the flu jeopardizes Hogan's plan to smuggle an underground agent out of the camp in the trunk of the ailing commandant's automobile.
Colonel Hogan receives a stunning message: he's to return home to the U.S.A. for a hero's welcome. The men of Stalag 13, convinced the Hogan will remain at the camp to continue his operation, are further stunned when he is overjoyed at the news --- and plans to bid Stalag 13 a fond farewell!
Corporal Newkirk sneaks into town for a romantic rendezvous with a German girl --- one who professes that she is on the side of the Allies. But when Newkirk sneaks her into the camp and shows her the gang's secret setup, she promptly reports her findings to Major Hochstetter!
After a first attempt to sneak four underground leaders out of the German camp fails, Hogan and his men come up with a new plan: Convince the camp commanders, via radio broadcasts and newspaper headlines, that the war is over!
Hogan and the gang decide that the hapless Colonel Klink would be the ideal patsy to use to get an important list of agents safely to England --- with a little boost from Carter's masquerade as a ferocious German general with a fondness for duels.
Hogan must deliver important information to a contact in the nearby town, but the Gestapo has cracked down tight on the camp. Will Hogan be forced to make traitorous pro-Nazi statements to Axis Annie of the German Propaganda Ministry in order to get the information to its destination?
Has Colonel Hogan finally snapped under the pressure of confinement? The men think so when Hogan suggests that, to rescue a captured British agent, the men of Stalag 13 take up basket weaving, tent making and kite flying!
LeBeau's weekly visits to an underground contact --- one he describes as a "mean little old lady" --- are revealed as something more after Hogan and the men discover that the "lady" is actually a beautiful young Dutch woman with whom LeBeau has fallen in love.
Hogan is asked to immobilize the entire German 6th SS division --- 10,000 men --- for two days while the Allies organize a surprise attack. The task seems impossible, especially in the presence of the two stern Gestapo colonels who are filling in for a vacationing Colonel Klink.
An arrogant German general arrives at Stalag 13 and orders Colonel Klink to guard a truckload of ammunition. But when Hogan discovers that the "ammo" is actually a collection of valuable pieces of art stolen from France, he masterminds a little theft of his own.
The Germans' top-secret weapon in there war effect is --- Sergent Schultz??? General Burkhalter and the other camp officials begin to think so after Schutzy starts to predict Allied attacks with uncanny accuracy!
Carter returns from an unsuccessful mission with a new pal in tow --- a runaway chimpanzee from the local bombed-out zoo. The men of Stalag 13 decide to make "Freddy" their barracks mascot --- but Hogan sees a more practical use for the happy-go-lucky chimp.
A German truck carrying an experimental jet fuel is the latest target for Hogan and the gang. But when all efforts to sabotage the shipment fail, Carter decides to get down to business with the remaining weaponry at hand --- a bow and arrow!