All goes well when Hogan's gang steals Klink's code book from his safe, photograph the contents, and returns it to its proper place. But there's a small hitch - Carter forgets to load the camera with film!
When Newkirk discovers a new radio-controlled tank that could win the war for Germany, the allies want Hogan and the men to photograph the tank and then destroy it - but complications ensue during their mission.
"Tiger," a female underground agent, is arrested while trying to document some secret German bases and is held in Paris for questioning. So Hogan and LeBeau become stowaways aboard Klink's staff car and head for Paris to free her.
While trying to free the underground agent "Tiger" in Paris, Hogan must seek help from a Parisian fortune teller and also enlist the aid of a man who is a look-alike for Nazi Police Chief Heinrich Himmler!
With camp security raised, Hogan and his men are desperate to smuggle some top-secret of German fortifications to allies. The solution? Make liberal use of Carter's remarkable impersonation of Adolf Hitler!
The aristocratic Colonel Klink fails a routine physical exam and lands a combat assignment at the Russian front! Fearing a hard-line replacement at Stalag 13, the men must do all they can to rescind Klink's marching papers.
Suspecting a security leak at Stalag 13, Gen. Burkhalter goes fishing with some false information and Col. Hogan falls for the bait. As a result, Burkhalter plants a spy among the prisoners to expose the guilty parties.
An assertive Gen. Burkhalter "requisitions" the famous Édouard Manet painting, The Fife Player," from the Louvre museum in Paris to give to Hermann Goering as a birthday present. Undaunted by seeming impossible logistics, Hogan and LeBeau decide to steal it back!
Col. Hogan is less than thrilled when he is assigned to help an obnoxious American general flee Stalag 13 - and the secret plan, involving a prisoner swap, winds up as trying and difficult as the arrogant escapee himself.
When the gang's hidden cache of money - needed to purchase a secret map - goes up in smoke, the men of Stalag 13 must come up with a way to replace the cash - and decide to pull off a bank heist in the nearby town.
Hogan nixes a mission to destroy a synthetic fuel plant because the caper is too risky...but he is overruled - and forced to participate in the scheme by the ploy's mastermind, a strong-willed determined female scientist.
Masquerading as German workers, Hogan and the crew have made elaborate and foolproof plans to blow a German cannon factory sky-high - but their plan backfires when Newkirk winds up being drafted into the German army.
When an important Gestapo official wants to defect, Hogan brings him to Stalag 13 - and convinces Col. Klink that the fugitive is Adolf Hitler in disguise...who is trying to elude assassins by hiding at the camp.
To improve the camp's inspection rating, Klink transfers in a stern German sergeant who quickly makes life miserable for staff and prisoners alike with his overly strict and unwavering adherence to all regulations. All want him gone.