<Li> Steven Barr voices Berserker, a monstrous Decepticon commando who transforms into a Chevy Tahoe emergency vehicle . </Li> <P> Starscream's severed head is shown being boasted by Daytrader, and later held by Megatron . In Sir Edmund Burton's castle, a picture of Shockwave is seen . </P> <Ul> <Li> Gemma Chan as Quintessa, a mysterious sorceress, the "Prime of Life" and the creator of Cybertronians who wants to destroy "Unicron" and rebuild Cybertron . </Li> <Li> The Knights of Iacon, a group of twelve Cybertronian Knights who protects the Staff and merge to form the three - headed dragon, Dragonstorm . They include Dragonicus, Stormreign, Steelbane, and Skullitron . </Li> <Li> Infernocons, Quintessa's demon - like guardians who combine to form Infernocus . </Li> <Li> Unicron, a giant planet - destroying Transformer who is mentioned at various points throughout the film; six of his mechanical horns are seen on Earth . </Li> </Ul> <Li> Gemma Chan as Quintessa, a mysterious sorceress, the "Prime of Life" and the creator of Cybertronians who wants to destroy "Unicron" and rebuild Cybertron . </Li>

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