The Autobots are a fictional faction of sentient robots in the Transformers multimedia franchise. The Autobots are living robots from the planet Cybertron who, like most Transformers, are each imbued with a unique "life force" known as a "spark." Led by Optimus Prime in most stories, the Autobots believe "freedom is the right of all sentient life" and are often engaged in a civil war with the Decepticons, a faction of transformers dedicated to military conquest and usually headed by Megatron. In a mirror universe portrayed in Transformers: Shattered Glass, the Autobots are villains opposed by the heroic Decepticons.