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Transformers are fictional alien robots of a popular Hasbro toy line and its spin-offs. In its fictional backstory, the Transformers come from the planet Cybertron and are divided into two factions: the heroic Autobots, led by Optimus Prime, and the evil Decepticons, led by Megatron. They are able to "transform", rearranging their bodies into common or innocuous forms, including vehicles, devices or animals. They can displace mass, combine with one another, and apply synthetic flesh. This ability to transform is reflected in the accompanying television programs' taglines: "More Than Meets the Eye" and "Robots in Disguise". All Transformers stories and characters, in a range of media, have been based around this core concept since the toy line's debut in 1984. The largest Transformer story-arc, retroactively known as Transformers: G1, includes both the animated television series The Transformers and the Marvel Comics comic-book series of the same name, which is further divided into Japanese and British spin-offs, respectively. Sequels followed, such as the Generation 2 comic book and Beast Wars TV series which became its own mini-universe. Generation 1 characters underwent two reboots with Dreamwave in 2002 and IDW Publishing in 2006. There have been other incarnations of the story based on different toy lines during the 2000s. The first was the Robots in Disguise series, followed by three shows that consist of the "Unicron Trilogy". A live-action film was also released in 2007, again distinct from previous incarnations, while the Transformers Animated series merged concepts from the G1 story-arc and the 2007 live-action film.