Plot summary

Outlaw Johnny Finger, better known as The Rumpo Kid (Sid James), rides into the frontier-town of Stodge City (which has a total population of 204 people), and immediately guns down three complete strangers, orders alcohol at the saloon (Charlie (Percy Herbert) is the bartender of the saloon) - horrifying Judge Burke (Kenneth Williams), the teetotaler Mayor of Stodge City Rumpo then takes over the saloon, courting its former owner, the sharp-shooting Belle (Joan Sims), and turns the town into a base for thieves and cattle-rustlers. Belle convinces Rumpo to check in his guns with Charlie, while she keeps her own gun on her person.Rumpo kills the town's sheriff, Albert Earp (Jon Pertwee). Earp was hard of hearing and couldn't see anything without his spectacles. He was useless in defending the town. When Earp confronts Rumpo, he kills Earp with Belle's gun. Under Rumpo, booze starts flowing again in Stodge city as criminals take over. When confronted by Burke, Rumpo denies all charges of cattle rustling.In Washington DC, Englishman Marshal P. Knutt (Jim Dale), a "sanitation engineer first class", arrives in America in the hope of revolutionizing the American sewage system. He accidentally walks into the office of the Commissioner (Alan Gifford), thinking it to be the Public Works Department, and is mistaken for a US Peace Marshal, and is promptly sent out to Stodge City. Knutt is travelling on a coach train with a Lady named Annie.The Rumpo Kid hears of the new Marshal and tries all he can to kill the Marshal without being caught, including sending out a pack of Indians, led by their Chief Big Heap (Charles Hawtrey). Rumpo had convinced the Chief to attack Knutt by bribing him with his favorite whiskey brand. Knutt is saved by the prowess of Annie Oakley (Angela Douglas), who has arrived in Stodge to avenge Earp's death (Earp was her father) and has taken a liking to Knutt.Knutt reaches Stodge city with Annie. Annie takes up quarters in the only hotel in town, run by Belle. Judge Burke quickly realizes that Knutt is just a sanitation engineer & not a peace Marshall. The Rumpo Kid then hangs Knutt after framing him for cattle rustling & getting him caught red handed by the owners of the cattle. Rumpo tells Knutt via Burke about possible castle rustlers at a particular ranch. When Knutt goes to investigate at night, Rumpo informs the owners of the ranch to be prepared for Knutt, whom Rumpo says is the real cattle rustler. Annie once again rescues him from the lynch mob as she scares them off with her gun shooting and makes away with Knutt. Annie is an excellent marksman.Annie then seduces the Rumpo kid, which infuriates Belle, who has taken a liking to him. Rumpo boasts to Annie that he was the one who killed Sheriff Earp. Annie makes a plan to make Rumpo come to her bedroom & then to shoot him down. But Rumpo keeps getting interrupted. First Chief Big Heap comes around asking for more booze else he will expose Rumpo's role in trying to kill Knutt. Then Knutt comes with Burke to arrest Rumpo. Knutt says that he found branded cattle skin in Rumpo's cabin. The branch matches the ranch that reported stolen cattle previous evening. Rumpo denies all knowledge and says he was at the saloon all night. Knutt finds Big Heap wandering the streets, drunk and talking about Rumpo being a criminal. Knutt brings him to the station for safe-keeping. As a result, Rumpo's associate enters Annie's room, and she shoots him.Belle and Annie both approach Knutt with proof of Rumpo's involvement in the castle rustlings and the murders in town. So, Rumpo breaks out Big Heap from the station cell and approaches the Mayor & offers him a 25% cut of all his earnings, if he gets rid of Knutt.Eventually, Knutt runs Rumpo out of town, but once Rumpo discovers from Burke that Knutt really is a sanitary engineer and not the Peace Marshal as he once thought, he swears revenge, returning to Stodge City for a showdown at high noon. The rest of Stodge city runs away from the upcoming gun battle, but Annie stays back to teach Knutt how to shoot and to attack.By hiding in the sewers beneath the main street, Knutt kills off Rumpo's gang, but fails to capture Rumpo, who escapes with the aid of Belle.