Since the early days, Jerry Lewis—in the line of Chaplin, Keaton and Laurel—had the masses laughing with his visual gags, pantomime sketches and signature slapstick humor. Yet Lewis was far more than just a clown. He was also a groundbreaking filmmaker whose unquenchable curiosity led him to write, produce, stage and direct many of the films he appeared in, resulting in such adored classics as The Bellboy, The Ladies Man, The Errand Boy, and The Nutty Professor.

London nightclub buddies Salt and Pepper link Pepper's dead twin to diamond smugglers.

Lester is a clumsy and awkward TV repair man who is nevertheless gifted technically. In helping out a friend, he is drawn into a mystery involving a missing heir in a rich family. He begins to notice little things, like how much those family portraits look like him. Surely..no..he can't be...can he ?

The Navy expects a veteran to pay for the ship he commanded, as they have no record of its return.

An artist has an opportunity to go to Paris and wants to bring his fiancee along. However, she's a psychiatrist who currently has three female patients who don't like men. So, he guises himself as three different men to gauge their trust and hopefully cure them so that his fiancee can go with him.

The weirdest alien of the galaxy pays a visit to Earth... Jerry Lewis is Kreton, a childish alien who, against his teacher's will leaves his planet to visit the Earth, and lands in the backyard of a famous television journalist who doesn't believe in UFOs and aliens. Wanting to study humans but not able to fully understand them, Kreton makes a mess out of it, generating a lot of comic situations.

Brendan Byers III, one of the richest men in America, has been pronounced 4-F and can't serve his country in its war against Hitler. Byers does not take "No" for an answer and recruits other 4-F's to fight against Hitler.

Rich momma's boy Wade Kingsley Jr. an Eastern dude, tries to follow in his murdered father's footsteps by returning to the West to partner up with Slim Moseley Jr.,the son of his father's former partner. Wade overcomes Slim's initial reluctance to accept him by using his fortune to buy a prize cow and new car to help Slim in his job as foreman on the Kingsley family ranch, currently under siege by a gang of outlaws called "masked raiders." Wade generously tries to pay off the ranch's mortgage with $15,000 of his own money, but unfortunately neither "pardner" realizes that respected banker Dan Hollis, the son of their fathers' murderer, is the leader of the gang.

Norman Phiffer, a proud man in a humble life, doesn't know that his girlfriend, Barbara, is heir to the Tuttle Department Store dynasty. Mrs. Tuttle, Barbara's mother, is determined to split the two lovers, and hires Norman in an attempt to humiliate him enough that Barbara leaves him. Will she ruin their love, or will he ruin her store?

Nightclub entertainer Hap Smith has a new act since his former partner Chick Allen joined the army. With his lovely new female partner, Hap now plays a clownish parody of a soldier. When Chick organises a soldier show at Fort Benning, he realizes he needs his former partner's help—so, to get onto the base, Hap impersonates a hapless real soldier, but circumstances force them to prolong the masquerade, creating an increasingly tangled Army-sized SNAFU.

Although the son of a skilled golfer and an outstanding player in his own right, Harvey Miller is too nervous to play in front of a gallery, so he acts as coach and caddy for Joe Anthony, his girlfriend's brother.

本片揭示了好莱坞历史上最神秘的事件之一：喜剧传奇杰瑞·刘易斯最后自导的电影《The Day the Clown Cried》。这部电影在1972年引起了全球的广泛关注和期待，却在最神秘的情况下突然消失，再也没有露面……五十多年来，关于这部所谓“失落电影”的各种离奇理论层出不穷，但现在终于有新的线索揭开了这段黑暗历史的真相。这场历史寻宝之旅中，众多明星和杰瑞·刘易斯的好莱坞朋友们纷纷为他的持久遗产和雄心壮志发声。观众将首次目睹大量从未曝光过的制作片段以及这部“失落杰作”的幕后花絮。

A rich, beautiful couple give birth to deformed alien twins who, when their heads are together, are the smartest kids on the planet.

Two former nightclub partners are now enlisted in the Army. Sergeant Puccinelli ranks above his former partner, Private First Class Korwin. Puccinelli is desperately trying to get transferred from his dull job to active duty overseas. Meanwhile, all Korwin wants is a pass to see his wife and new baby.

Gerald Clamson (Jerry Lewis) is a bank examiner who loves fishing on his annual two week holiday. Unfortunately one day at the ocean he reels in an injured gangster in a scuba diving suit named Syd Valentine (also played by Lewis). Syd tells Gerald about diamonds he has stolen from the other gangsters and hands him a map. Gerald escapes as frogmen from a yacht machine gun the beach. They swim ashore and locate Syd where they machine gun him. Their leader Thor (Harold J. Stone) ensures Syd's demise by firing a torpedo from his yacht that goes ashore blowing a crater into the beach.
As the police ignore Gerald's story, Gerald heads to the Hilton Inn in San Diego where Syd claimed the diamonds were hidden. There he meets Suzie Cartwright (Susan Bay), an airline stewardess. While searching for the diamonds, he needs to avoid the hotel staff after inadvertently hurting the manager (Del Moore). Gerald disguises himself as a character noticeably similar to Professor Julius Kelp from The Nutty Professor, while trying to stay one step ahead of the other gangsters who are on his tail, as well as the hotel detectives led by the manager - all the while courting Suzie. As each of the gangsters see Gerald, an identical lookalike to the deceased Syd, they have nervous breakdowns; one imagining himself a dog, one turning into a Larry Fine lookalike, the other (Charlie Callas, in his usual character) becoming a hopeless stutterer. The one man Gerald meets the who believes him, who identifies himself as a FBI Special Agent, turns out to be an escapee from an insane asylum.
The movie climaxes in a chase through Sea World San Diego, where Gerald is pursued by Thor's gangsters, a rival group of gangsters who had made a deal with Syd to buy his diamonds, and a group of Chinese who smuggle the diamonds disguised as plastic pearls. Gerald disguises himself as a Kabuki dancer but is pursued until Suzie rescues him by flying by with a helicopter and dropping a rope ladder that Gerald escapes on. They return to the Pacific Ocean, where Syd reappears. The gangsters chase Syd into the ocean, and Gerald and Suzie walk away, deeply in love. The diamonds are never located.
The final scene shows the narrator, Frank De Vol, facing the camera and solemnly announcing that the tale is true—then the camera pulls back as De Vol turns and walks away on the breakwater where the beginning and ending action had taken place. De Vol is wearing all of a business suit except trousers, and he is carrying a briefcase.

Warren Nefron is a hopeless klutz who has some of the worst luck in the world: when he tries to end it all with a foolproof suicide plan, he still manages to mess it up. In desperation, he goes to a psychiatrist to see if there is some way for him to end his troubles. As the doctor talks with him, the film cuts to a series of shorts about scenes from Nefron's life, and the lives of the people around him.

Poor Jerome Littlefield. He wants to be a doctor – but that's not exactly the perfect career choice when you're hopelessly squeamish. So he settles for the job of orderly at the Whitestone Sanitarium, a career move that's guaranteed to keep the patients – and viewers – in stitches!

Gilbert Wooley is a second-rate magician who is sent to entertain the troops in the pacific. During his time in Japan he becomes attached to a little orphan boy.

In Jerry Lewis's first film in a decade, he plays Bo Hooper, an unemployed circus clown who can't seem to hold down a job. The film opens with a brief montage of clips from past Lewis movies. He then moves into a succession of jobs that he gets himself fired from including a gas station attendant and a mailman - all with disastrous results.