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The film revolves around the Maximals, led by Lio Convoy; the Predacons, led by Galvatron; and a mysterious device that has crashed on Planet Gaia (a future version of Earth), leading to the arrival of a legendary Maximal warrior, and the protagonist of the original Beast Wars series, Beast Convoy (Optimus Primal). Galvatron also uses the device to summon a monster Decepticon called Majin Zarak, who threatens to destroy all the Maximals. *(Source: Wikipedia, edited)*