The first Cybertron Optimus Prime toy transforms into a heavily-armed fire truck of made up origin, topped with two large cannons. The left fires a spring-loaded translucent blue missile, while the right features electronic sound effects and a flashing red LED. The cannons and the sides of the truck fold down to create an unlikely flight mode for the vehicle.
Optimus Prime has fictionally shown a dislike of certain kinds of music and dance. For the Marvel Comics continuity, the letters page for issue 324 mentions he hates the music of Mötley Crüe. In the cartoon continuity, "Blaster Blues" and "Quest for Survival" have Optimus react noticeably more passive-aggressively to Blaster's choice of music than the other Autobots. And in the Dreamwave Generation One continuity, Hardwired features an uncalled for negative remark about Jazz's dance skills.
Like the larger First Edition figure, you can actually separate the robot mode from his vehicle shell, displaying both of his modes at once... albeit unlike the First Edition figure, this tweak could sacrifice the even stability between those two separated figures. Some of the pieces like the legs/rear wheels are particularly difficult to separate.
Transformers: Energon introduced several new concepts to the toy line. Two new sub-groups, the Omnicons and Terrorcons, joined the fray, representing smaller factions of the Autobots and Decepticons respectively. The smaller toys in these sub-groups came with Energon weapons that could be used by the larger Autobots and Decepticons, along with Energon chips that could be fastened to the larger figures to enhance their power. Energon weapons and chips came in a variety of colors of translucent plastic. Many Autobot figures in the line were able to combine with a partner to form a larger robot through the "Powerlinx" process. The Decepticons were designed instead with alternative "attack modes". While no longer the focus of the line, there were several Mini-Con releases in Energon as well.
Unlike the other Swordbot toys, Optimus Exprime's kabuto helmets form an integral part of one of his alternate modes. The kabuto helmet designed for use with his DaiGekisou combination forms the head of his dragon form, while the kabuto helmet designed for use with his DaiKenzan combination forms the "tail" of the same. He comes with two HUGE swords (with 5mm handles) which can be attached to several places on his kabuto helmets or either alternate form, held separately in his hands, or held both in the same hand (with one held in reverse-grip).

The price per minifigure has definitely gone up in the past 5 years. You used to be able to get 4 minifigs (along with some other stuff) at the $9.99 price point, now these are $12.99. And there are fewer minifigs in most $19.99, $29.99, etc. sets now. Lego Minifigures Series 1 was $1.99 each, subsequent series $2.99 each – I know it’s supply and demand, but it still feels kind of exploitative. I admit the cleverness of the builds keeps improving though.

Part of the first wave of Age of Extinction: Generations Voyager Class toys, "Evasion Mode Optimus Prime" is an all-new figure based on the character's initial form in the film, transforming from a cab-over semi truck into a robot mostly similar to his previous movie design. The truck mode is heavily based on Generation 1 Optimus Prime's White Freightliner WFT alt mode in both sculpt and deco, although it draws a few details, such as the singular smokestack and wheel designs, from the heavily faded Marmon 97 seen on-screen. In robot mode, he sports faux-kibble windows and, amusingly, two false smokestacks. Unfortunately, due to being used with the transformation, he lacks the real elbow joint on the arm, which makes the lower section of the arm the only poseable section. Also, Optimus can wield weapons with longer posts while his arms are in a "default" 90° position.
Activision and Traveller's Tales, creators of the Lego Star Wars games, released Transformers: The Game in 2007, accompanied by Transformers Autobots and Transformers Decepticons, to tie in with the live-action feature film for the Sony PlayStation 3, Microsoft Xbox 360, Nintendo Wii, Nintendo DS, PC, Sony PlayStation Portable, and PlayStation 2. The player was able to play as both the Autobots and the Decepticons, pick up and throw objects, and transform at any time. The steering in vehicle mode was compared to that of the Grand Theft Auto games and had a free-roaming environment.
This incarnation of Optimus Prime first appeared in the Transformers: Universe comic series in issue #2. As part of Omega Prime, he was escaping with various other Transformers from Unicron. He appeared again at the end of issue #3, brought in to Alpha Trion's lab to aid Optimus Primal. After this, both Prime and Magnus became part of Optimus Primal's army of Autobots, battling against Unicron's Decepticons.
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.
Available exclusively from Japanese clothing company A Bathing Ape in 2014, MP Convoy Reissue BAPE Ver. is a trailer-less redeco of the MP-10 mold sporting a green color scheme matching the Convoy Reissue BAPE Ver. of the original G1 toy, with "BAPE's famous camouflage pattern" and an ape head print on the shoulder replacing the usual faction symbol.
He reappeared in the third crossover, where he apparently acted as Optimus Prime's right-hand man. Putting a team together to look for the missing team that had journeyed to Earth (who had been captured by Serpentor and the Decepticons), he would later lead the combined G.I. Joe/Autobot force that rescued Optimus Prime. In contrast to his usual "youthful rookie" portrayal here Hot Rod seems to be in a high command position, outranking Ultra Magnus, Prowl and Ironhide among others. However, by the fourth crossover Hot Rod is forced to wait on Cybertron under Magnus's command as Optimus Prime journeys to Earth.
Most notably in terms of new tooling, the panels on the undersides of Powermaster Optimus Prime's forearms feature slots under the fists, which allow the guns to tab in and be held much more stably than with Ultra Magnus. And due to the amount of empty space in the cab area in vehicle mode, Powermaster Prime can fully transform without the need to remove his head.
The lowest priced toys in the Armada line were three-packs of Mini-Cons. Each larger price point consisted of an Autobot or Decepticon who came with a Mini-Con partner. Mini-Cons could be used to unlock a variety of features on each larger robot, such as firing weapons, electronic lights and sounds, or alternate modes. Some three-pack Mini-Cons combined into other forms or had additional features. According to the storyline, Mini-Cons also enhanced the power of other Transformers, giving incentive to collect as many of them as possible.
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