The TARDIS arrives on the planet Marinus on an island of glass surrounded by a sea of acid. The travellers are forced by the elderly Arbitan to retrieve four of the five operating keys to a machine called the Conscience of Marinus, of which he is the keeper. These have been hidden in different locations around the planet to prevent them falling into the hands of the evil Yartek and his Voord warriors, who plan to seize the machine and use its originally benevolent mind-influencing power for their own sinister purposes.

The Avengers is a British television series created in the 1960s. It initially focused on Dr. David Keel and his assistant John Steed. Hendry left after the first series and Steed became the main character, partnered with a succession of assistants. His most famous assistants were intelligent, stylish and assertive women: Cathy Gale, Emma Peel and Tara King. Later episodes increasingly incorporated elements of science fiction and fantasy, parody and British eccentricity.

In this musical comedy, the trouble begins when a carefree playboy steals the virtue of a young French maiden and is forced to marry her when her angry father, a financier finds out. The playboy is flat broke, but does the honorable thing. The newlyweds then board a ship and sail off to the States. They are accompanied by the girl's ex-fiance. The plan was for the young marrieds to get a divorce as soon as possible, but then the groom realizes that he really does love the girl. Happiness ensues

The woman who will become Catherine the Great marries into the Russian royal family when she weds Grand Duke Peter, the nephew of Empress Elizabeth. Although the couple has moments of contentment, Peter's cruel and erratic behavior causes a rift between him and Catherine. Mere months after Peter succeeds his aunt as the ruler of Russia, a revolt is brewing, and Catherine is poised to ascend to the throne as the country's new empress.