Prague, Bohemia, 1820. Balduin, a penniless student, falls in love with Countess Margit, a wealthy noblewoman whom he has saved from drowning.
An impecunious customer creates chaos in a department store while the manager and his assistant plot to steal the money kept in the establishment's safe.
A poor man assumes the identity of a wealthy look-alike after accidentally killing him; his wife prefers the new, non-abusive version and falls in love him.
New York society member Priscilla Maine is troubled by strange dreams in which she vividly sees members of the underworld involved in a murder. She confides this to her admirer, Dr. Philip Fosdick, who undertakes to solve the mystery.
Gabriela Farnese, a famous singer, visits Bombay to find her mysterious doppelganger, the dancer Concha.
Two men who bear a striking resemblance to each befriend each other while stationed in France during WWI. One is fatally fatally wounded and requests makes a dying request to his doppelganger to take on his identity.
Young Steffi goes to the city to take a job in a factory and falls for the son of the owner.
The Portorican prime minister asks British detective Sherlock Holmes to find a twin for King Fernando XXIII, a weak and frightened man who fears anarchists and does not want to show himself in public. Holmes finds in the Czech newspapers a photo of the perfect double, František Lelíček, a daring bon vivant drowned in debt, so when Holmes offers him money, Lelíček decides to travel to Portorico and play the role.
Two sailors get caught in a mountain of mix-ups when they meet their long-lost twins. Laurel and Hardy play themselves and their twins.
Two boys – the prince Edward and the pauper Tom – are born on the same day. Years later, when young teenage Tom sneaks into the palace garden, he meets the prince. They change clothes with one another before the guards discover them and throw out the prince thinking he's the urchin. No one believes them when they try to tell the truth about which is which. Soon after, the old king dies and the prince will inherit the throne.
Returning from America where he received a large inheritance, Alaric would like to have a wedding before returning to the family home where his sister, who is as cantankerous as she is uncompromising on principles, awaits him. He asks a “porter” from the station who looks like him to replace him.
It is prior to the commencement of World War II, and Japan's fiendish Black Dragon Society is hatching an evil plot with the Nazis. They instruct a brilliant scientist, Dr. Melcher, to travel to Japan on a secret mission. There he operates on six Japanese conspirators, transforming them to resemble six American leaders. The actual leaders are murdered and replaced with their likeness.
Judge Kirby is being blackmailed and forced to let outlaws go free. He was once the partner of Roy's father and when Roy reads in the paper that he is in trouble he heads out to help him. Arriving, Roy quickly realizes he has been mistaken for one of the outlaws and is not wanted in town. However he stays, and now posing as that outlaw, hopes to learn who is causing all the problems.
Johan Tiger is an actor in Stockholm during World War II. A British agent in Sweden discovers that Johan is a dead ringer for General Lucky and manages to lure him over to London with a role as Othello as bait.
A hypnotist uses his powers for revenge against King Louis XV's court.
The Emperor's mismanagement of his country is provoking some in his court to plot to overthrow him. He feels successful, at least, when he discovers the legendary Golem, which he believes can protect him and even cure his imaginary illnesses but, when he disappears while on a bender, his kindly baker, who looks just like him, is mistaken for him, and begins to put things in order. However, the conspirators, not to be outdone, determine to bring the Golem back to life to do their bidding.
Carlos Delargo, the banished son of a royal princess of Mandorra, is returned to the kingdom to be tried for a murder change. However, he is freed by King Lorenzo, whom bears a remarkable resemblance to Delargo. When the king is wounded by assassins sent by Napoleon, Delargo takes over the throne at the request of the Prime Minister in a plot to thwart the traitors. He also falls in love with Princess Teresa, the king's fiancée.
The short-tempered Daffy Duck must improvise madly as the backgrounds, his costumes, the soundtrack, even his physical form, shifts and changes at the whim of the animator.
The porter of the hotel is trying to keep his sanity when two guests who share both looks and name check in. He's also unaware that his new bell boy is actually the owner's daughter in disguise.
A small-town doctor learns that the population of his community is being replaced by emotionless alien duplicates.