The very first Conan cinematic project was planned by Edward Summer. Summer envisioned a series of Conan films, much like the James Bond franchise. He outlined six stories for this film series, but none were ever made. An original screenplay by Summer and Roy Thomas was written, but their lore-authentic screen story was never filmed. However, the resulting film, Conan the Barbarian (1982), was a combination of director John Milius' ideas and plots from Conan stories (written also by Howard's successors, notably Lin Carter and L. Sprague de Camp). The addition of Nietzschean motto and Conan's life philosophy were crucial for bringing the spirit of Howard's literature to the screen.
The plot of Conan the Barbarian (1982) begins with Conan being enslaved by the Vanir raiders of Thulsa Doom, a malevolent warlord who is responsible for the slaying of Conan's parents and the genocide of his people. Later, Thulsa Doom becomes a cult leader of a religion that worships Set, a Snake God. The vengeful Conan, the archer Subotai and the thief Valeria set out on a quest to rescue a princess held captive by Thulsa Doom. The film was directed by John Milius and produced by Dino De Laurentiis. The character of Conan was played by Arnold Schwarzenegger and was his break-through role as an actor.
This film was followed by a less popular sequel, Conan the Destroyer in 1984. This sequel was a more typical fantasy-genre film and was even less faithful to Howard's Conan stories, being just apicaresque story of an assorted bunch of adventurers.
The third film in the Conan trilogy was planned for 1987 to be titled Conan the Conqueror. The director was to be either Guy Hamilton or John Guillermin. Since Arnold Schwarzenegger was committed to the film Predator and De Laurentiis's contract with the star had expired after his obligation to Red Sonja and Raw Deal, he wasn't keen to negotiate a new one; thus the third Conan film sank into development hell. The script was eventually turned into Kull the Conqueror.