This Classics Optimus Prime is a smaller, deluxe-class toy bearing a greater resemblance to the original G1 toy. He was only available in a special Versus pack with a similarly unique Classics Megatron toy and later the FAB version of the 2007 movie Prime. Later releases of this toy had him individually packed in some European countries. His vehicle mode and robot mode is based upon the original toy, but due to limitations in design, budget and gimmick, does not succeed very well. His thighs cannot collapse into his lower legs, meaning they are exposed in vehicle mode, as is his head. Although to be fair, you wouldn't really notice the leg thing if he had a trailer. But, he is greatly articulated.
The Happy Meal version of Energon Optimus Prime features a very similar transformation sequence to his larger figure, though his limited articulation means that his shoulder insignias aren't visible in robot mode when his arms are facing forward. His torso is hollow to contain his electronic "Energon Cube" accessory, which generates effects when activated by remote control. This remote is in the form of the Mini-Con jet Wreckage, and can mount on the top of his cab in truck form.
The sequel series, Transformers: Generation 2, began an undisclosed period of time later. At the beginning of the series, Prime was restored to a form resembling his original body. He and the Transformers found themselves caught in the schemes of a new generation of Cybertronians, led by the icy Jhiaxus, who were colonizing and cyber-forming other worlds. Plagued by nightmarish visions of a life-destroying entity called "the Swarm", Prime looked into Cybertron's past and discovered that Jhiaxus and his kind were the result of an unintentional Transformer reproduction. Their nature and intent, he found, was distilled to the purest, most unemotional form of conquest and that the Swarm was the by-product of this process. To fight this new enemy, Prime and the Autobots entered into an alliance with the recreated Megatron's Decepticons. Though Prime was eventually consumed by the abomination and destroyed, he was able to unleash the energies of the Matrix into the Swarm, purifying it. In parting, the Swarm recreated Prime in a new form, and he and Megatron set out to lead the united Autobots and Decepticons into a new age.
Aside from the Powermaster feature itself, the main gimmick of the toy is the ability of the truck cab to combine with the trailer to form the larger "Super Optimus Prime" figure. This is essentially accomplished by standing the trailer up, folding the cab in half and inserting it into the empty cavity in the trailer's torso, forming an imposing—if almost entirely unposeable—robot form armed with all four weapons. The head of this super robot form is a separate piece which can be stored in the rear of Prime's trailer when not in use. While Hi-Q was always shown plugged into Prime's chest in artwork of this mode (as seen in the picture here), this was actually entirely unnecessary as transforming into Super Optimus Prime didn't require the standard Prime toy's legs to be unlocked.
Available only at KB Toys, Machine Wars Optimus Prime is a redeco and slight retool of the European Generation 1 exclusive Turbomaster leader Thunder Clash, transforming into a Cybertronic truck cab. It's easy to see why Thunder Clash was chosen to become the new Optimus Prime, given his adherence to Prime tradition: the cab disconnects to become the robot, while the trailer unfolds to become an assault tower with twin missile launchers. On the original Thunder Clash version of the mold, the launchers operated on a gravity-feed system that saw a new missile drop into the launcher from above each time one was fired, allowing for twelve to be fired in rapid succession, but for Machine Wars Prime, this feature had to be dialed back for safety reasons. The missiles had to be lengthened to prevent choking hazards, and so the toy's launchers were modified to accommodate them, becoming straightforward spring-loaded single-firing weapons.
In the Escalation miniseries, Megatron engages Prime and, boosted by Ore-13, overcomes him. Believing their leader dead, the rest of the Autobots attempt to buy the newly arrived Hot Rod time to collect the clone. Prime, who had transferred his consciousness to a backup memory in his trailer command post, advised them to exploit Ore-13's weakness and assault Megatron all-out, catalyzing the Decepticon leader's Energon supply and crippling him.
(translated from the Japanese Wikipedia article) The Transformers: Kiss Players was a Japan-only line of Transformers toys, manga, and audio dramas released in 2006. Kiss Players is set in an alternate Transformers universe where the Transformers are powered by the kisses of young girls. The toys themselves come packaged with small, scale figurines of the girls who power them. The toyline was openly admitted to be aimed at a specific part of the market — adults, rather than children. The comic that accompanied the Kiss Players was an unashamed reflection of this, with several images which were considered by some to be very sexually themed.