Transformers are fictional alien robots from 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 (the most common form), devices or animals. They can displace mass (i.e., shrink and expand), 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.
