Stargate is a science fiction franchise that began with the 1994 film directed by Roland Emmerich. The story revolves around a mysterious device called the Stargate, which allows for instant travel to other planets. The film's success led to the creation of several television series, including Stargate SG-1, Stargate Atlantis, and Stargate Universe. The franchise explores themes of exploration, adventure, and the interaction between different civilizations. It features a diverse cast of characters, including military personnel and scientists, who work together to uncover the secrets of the Stargate and protect Earth from various extraterrestrial threats.