John and his class visit the Tower of London, where he loses his pet mouse. He falls asleep during a lesson on electricity, but with some help, he learns about it, invades the Tower, and saves his pet.

An adventurer investigates the theft of a formula for hardened steel, assisted by his girlfriend.

A young Scotland Yard police academy recruit tries to break up a gang of thieves.

Canio and his Comedia dell'Arte troupe tour Italy. His wife Nedda meets a young cadet and they plan to elope. He tries to leave her when he finds how important she is for his husband, but a rejected trouper interferes. As jealous Canio suspects the truth the tragedy approaches. The film was partly made in Ufacolor.

Following her father's death, a teenage heiress moves in with her guardian uncle who is broke and schemes to murder his niece for her vast inheritance.

In Vienna, aspiring composer Johann Strauss Jr. clashes with his domineering father, who wants him to abandon music for a steady job in a bakery. Torn between his love for the baker’s daughter, Resi, and the encouragement of a wealthy countess, Strauss finds inspiration that leads to the creation of "The Blue Danube."

The story of the breakout of the German battleship Bismarck—accompanied by the heavy cruiser Prinz Eugen—during the early days of World War II. The Bismarck and her sister ship, Tirpitz, were the most powerful battleships in the European theater of World War II. The British Navy must find and destroy Bismarck before it can escape into the convoy lanes to inflict severe damage on the cargo shipping which was the lifeblood of the British Isles. With eight 15 inch guns, it was capable of destroying every ship in a convoy while remaining beyond the range of all Royal Navy warships.