Legion Class Optimus Prime is a redeco/retool of the first Revenge of the Fallen Legends Class figure, with the deco resembling the paint job from Optimus Prime's Western Star "5700 OP" concept truck. While the main body is identical to the figure, the arms and legs are newly tooled, with simple assemblies for the wheels. The retooled legs now features a more solid stopping point, which prevents the center front grill/legs to swing back further. It should be noted that his flame decals are painted over the side windows.
When animating the scene in which Primal removes Prime's spark, Mainframe's animators consulted The Transformers: The Movie for reference on the interior of Prime's chest. Not realizing the importance of the Matrix of Leadership, they rendered it as a container for Prime's spark. Beast Wars writers Larry DiTillio and Bob Forward have since claimed that in their view, Prime had not received the Matrix from Alpha Trion at this point, but a later comic produced for Botcon indicated that the Matrix was in fact stored in a secondary compartment, hidden behind Prime's spark. In this particular comic, the alien Vok used the Matrix, the Transmetal Driver, and a control suit once piloted by the Predacon Quickstrike to create Primal Prime.
In some continuities, though, it’s our lovable pal Bee who takes the leadership reigns. In the animated series Transformers: Robots in Disguise, with Optimus having died at the end of the previous series, Bumblebee starts off as the Autobot leader, but he’s apprehensive about it. And he even takes the leadership mantle in the live-action film series; taking over for Optimus, who leaves the Autobots behind to head into space to search for the Seed at the end of the last movie, Age of Extinction.
He comes with the Star Saber, which has a 5mm handle and a post on its hilt, as well as two spring-loaded, missile-firing "Ionic Pulse Launchers" (which are called "Eaglefire Missile Launchers" in the instructions). The launchers each feature a 5mm post, have flip open prods, and can peg onto the ports near the wheels on his robot back, giving him a pair of back-mounted rocket engines.
Commemorating the death of Optimus Prime in The Transformers: The Movie, this set contains a special version of the original Optimus Prime figure with show-inspired translucent blue windows. It was packaged with Ligier and Alert, in an apparent homage to the similar Diaclone "Powered Convoy DX" giftset that packaged the "Powered Convoy" version of the Optimus mold with figures using the molds of Ligier and Alert.
In the movie, he starts out as a 1976 Camaro before modernizing himself. But the 2007 version (the fifth generation of the model) was a concept car-- you couldn’t even buy a new Camaro until 2009. They later switched to the production version for the 2009 sequel Revenge of the Fallen and he was yet another updated model for Dark of the Moon in 2011 (the SS model). In Age of Extinction, he appears both as a 1967 model and another new model of the current version. Finally, back in June, Bay tweeted that in next year’s The Last Knight, Bee would be a custom-built 2016 Camaro. Over the first two years of the relaunch, Chevy sold an astounding 140,000 Camaros and saw a 10% spike in the yellow model, thanks largely to our friend Bumblebee.
The second known version  ditched the triplechanging gimmick on the cab and simplified things a good bit. This Powermaster Prime has several distinct characteristics only seen in the second design, such as the wider "block head" and two faux smokestacks on top of either shoulder as opposed to one. Also, in a rather odd twist, this design features a black head and fists for both super and regular modes rather than the traditional blue. It also had yellow eyes in either mode a la the original Optimus Prime.
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Originally, Optimus Prime was created as the leader of the Autobots, though it is unknown how he was created or his origins. In a possible future, Megatron was threatened by the existence of the Aerialbots and had Shockwave build a time machine to send them back in time to get rid of them. However, he only ended up changing history for the better. In the revised timeline, Optimus Prime began his life as a robot named Orion Pax, a mostly defenseless dock worker during the Golden Age of Cybertron nine million years ago, with a girlfriend named Ariel and a best friend named Dion. During this time, a new breed of robot with new flight capabilities appeared on the planet that Orion idolized. When Megatron, the leader of the new group of robots, approached him with inquiries about using one of the dock warehouses, Orion was swayed by Megatron. Both Orion and Ariel were severely wounded when Megatron and his forces attacked in order to claim the energy stored there. Searching for someone to help them, the time-displaced Aerialbots took Orion and Ariel to the ancient Autobot, Alpha Trion, who used them as the first subjects for the new reconstruction process he had developed involving rebuilding the frail Autobot frames into more battle-hardy configurations.