when Megatron and his Predacons arrive and wreak havoc in their attempts to attain the power of Earth's various energy sources. In this universe, Optimus Prime transforms into a fire engine. This is also the very first incarnation of Optimus Prime to transform into a Fire Engine. Unicron Trilogy The "Unicron Trilogy" version of Optimus Prime is a fictional character of this branch of Transformers lore. Appearing in Transformers: Armada, Transformers: Energon and Transformers: Cybertron, Optimus is the leader of the heroic Autobots. He often converted to his super combat mode. In all three series, Optimus' English voice actor is Garry Chalk, who previously voiced Optimus Primal in Beast Wars: Transformers and Beast Machines. In his first appearance in the series, Optimus looks similar to the original G1 Optimus Prime until he copies himself with a semi-truck and his design in robot mode changes. In this incarnation, Optimus Prime is the main protagonist and shows a near-xenophobic reluctance with interacting with other cultures, believing that such interaction would cause more harm than good. Consequently, he prohibits his team from mingling with the locals of Earth, Velocitron, and the Jungle Planet during their search for the Cyber Planet Keys. This attitude was drastically changed when Prime realized that the only way to acquire the Cyber Planet Keys from Velocitron and Animatros was to play by their laws. Transformers film series In the online CGI cartoon Cyber Missions produced by TG Studios for Hasbro's website, Optimus is once again seen fighting Megatron, this time with some help from Sideswipe. Optimus also helps Ironhide against Mindwipe. Transformers Animated Optimus Prime appears in the Transformers Animated series in 2008 as a red semi-trailer truck, able to be fitted with many "trailer" attachments, most notably one that effectively makes him a fire truck. Unlike the other Optimus Primes, this one is much younger. Optimus has the ability to change any part of his robotic body into a tool or gadget. He has swing lines in his wrists. His wrists can also fire capture bolas. His arsenal includes a grappler, fire extinguisher and a negative friction spray. Unlike in all the previous series, his face can almost always be seen, because his mouthplate is retractable like in the 2007 live-action film. Animated Optimus Prime, in an Earth-based fire truck mode, appears as a hidden character in the Transformers Netjet video game by Hasbro. Instead of being