Wagner’s Ring Cycle: A gold ring tempts mortals and immortals alike with the promise of absolute power, but bears a terrible curse. Includes, dwarfs, singing, and the twilight of the gods.
Tolkien’s The Lord of the Rings: A gold ring tempts mortals and immortals alike with the promise of absolute power, but bears the taint of evil. Includes dwarves, singing, and the twilight of the elves.
(Tolkien denied the rings had much in common.)
Orwell’s 1984: Sometime in the near future (relative to when the novel was written; the protagonist only guesses at the exact year) in England (Airstrip One, but the characters practice “English Socialism”), a meek, low-level employee of a monolithic government agency (Ministry of Truth) has a passionate affair and engages in acts of rebellion, leading to tragic results.
Gilliam’s Brazil: “Somewhere in the 20th centure” (where people talk of Father Christmas and trade in pounds), a meek, low-level employee of a monolithic government agency (Ministry of Information) has a passionate affair and engages in acts of rebellion, leading to tragic results.
(In interviews, Gilliam denied that Orwell was a conscious influence.)
Spartacus is the story of a gladiator who becomes a military leader and ultimately loses his life in defiance of a Roman tyrant. In gladiator school, he meets an African who will have a powerful effect on his life. The owner of the school proves to be a more sympathetic character than we at first suspect. Noted Shakespearean actor Laurence Olivier plays a Roman senator.
Gladiator is the story of a military leader who becomes a gladiator and ultimately loses his life in defiance of a Roman tyrant. In gladiator school, he meets an African who will have a powerful effect on his life. The owner of the school proves to be a more sympathetic character than we at first suspect. Noted Shakespearean actor Derek Jacobi plays a Roman senator.
Lost World (1925): Huge beast (brontosaurus) brought from remote South American jungle escapes from exhibition and wreaks havoc in metropolitan London. Based on a story by Arthur Conan Doyle. Special effects by Willis O’Brien.
King Kong (1933): Huge beast (giant ape) brought from remote island jungle escapes from exhibition and wreaks havoc in metropolitan New York. Special effects by Willis O’Brien.
The subplot of the human and alien stalking each other through the corridors of the spaceship in Dark Star would show up again in Alien, which had the same screenwriter. (Although the alien in that film was scarier than a beachball with feet.)
Although the setting and plot was very different, Fritz Lang’s Metropolis used the premise of subterranean workers and an above-ground leisure class, which had previously figured into H.G. Wells’ The Time Machine.
The spectacular scene in the 1931 Frankenstein in which Dr. F uses electricity to animate his monster was not in the novel. It may have been inspired by the electrical light show in Metropolis that transforms a robot into the semblance of a living woman. That’s the same robot that inspired C3PO. (I think the resemblance is more striking in some of the Star Wars concept drawings than in the finished version.)