The character of Optimus Prime first appears in Transformers (film) as the leader of the Autobots in the search for the Allspark. After arriving and scanning a Peterbilt truck, Optimus greeted Sam Witwicky and Mikaela Banes, introducing his men and explaining why they had come to Earth. They escorted the humans back to Sam's house to retrieve the pair of glasses that would lead them the Allspark. When Sam and Mikaela were captured by a Sector 7 agent named Simmons, Optimus intercepted their car and surrounded the Sector 7 agents, curious that Simmons was not afraid or surprised by their appearance. When backup arrived, Optimus took the teens on his back and ran, taking cover under a bridge. Though Sam, Mikaela, and Bumblebee were captured, Optimus retrieved the glasses and prepared to lead his other men to get the Allspark, pointing out that, if it came to it, he would sacrifice himself by shoving the cube into his chest to prevent he Decepticons from getting control of the Allspark. When they discovered Bumblebee and the humans were free and being escorted by the military with the Allspark, Optimus joined their convoy. Along the way they, are attacked by Bonecrusher. Optimus engages him, killing him by using his Energon blade. Arriving in the city, he briefly confronted Megatron, but was left stunned. When he recovered, he rescued Sam as he was falling from a building and warned him that if he could not defeat Megatron before going into battle, he needed to place the Allspark in his chest. Optimus is nearly defeated by Megatron before Sam kills the Decepticon by ramming the Allspark into his chest. Optimus is grateful to Sam for saving him, and he and the other surviving Autobots decide to remain on Earth since Cybertron cannot be restored without the cube. The film ends with Optimus sending out a deep-space signal, inviting other Autobots to join them on Earth.
Ugh. Hey, congrats to everyone who wanted this, but do we really need another MP Prime? MP-10 is fantastic as it is, and it certainly looks better than this. MP-10’s only problem for me was the faux grille. If they made a new MP Prime that looked good and didn’t use a faux grille, then I would be interested. Instead it looks like none of the front uses any real truck parts; even the chest windows look different from the truck windows!
The second Optimus Primal toy was an ape in the Ultra size class. Though the transformation from primate to humanoid was a relatively simplistic one, the toy compensated with more than a fair share of weaponry and action features. A compartment on his right forearm opened to reveal a skull-shaped mace he could hold in his fist. His left forearm could open into a double-barreled missile launcher. On his back were two spring-loaded missile launchers which auto-flipped over each shoulder. By pulling a lever in the center of his back, both arms would either spin at the bicep or bend in and out at the elbow, depending on the placement of notch-buttons located on either bicep. This gimmick was shown to be an effort to simulate a gorilla beating its chest while Optimus was in beast mode, but could also be used in robot mode, making him swing his weapons wildly before himself. And finally, like many first-year Beast Wars toys, a battle mask/"mutant head" could be deployed over his robot head.

At BotCon 2005, Hideaki Yoke revealed that Optimus Prime (or more accurately, Diaclone Battle Convoy) was not designed by a single person, but rather a team of Takara designers as the one who was originally assigned the job had fallen behind. It is said that a young Shoji Kawamori was also a member of this team at some point, who would design THS-02 Convoy over 20 years later. The patent for the toy, however, lists Hiroyuki Obara as the designer.
Optimus Prime was subject to several molding and color variations in his early days. The earliest release of the figure featured larger fists, a gun with a thick, round barrel, a slightly-differently shaped gas pump, grey rockets, a grey Roller, a grey launcher in his Combat Deck, and metal plates in the floor of the Combat Deck (a holdover from the Diaclone version of the toy, to which the magnetic feet of the pilots could cling). In short order, his fists were slimmed down, the gun's barrel was pared down to a more slender form, the gas pump's shape was altered, the rockets and launcher were recast in black plastic, the metal plates were removed from the Combat Deck, and Roller's color was changed to a light blue. Along with Roller's color change, however, the Combat Deck's drone pod also became light blue, and a third running change soon followed that saw it restored to its original darker blue, and Roller changed along with it. These modified components would become the default accessories used by subsequent reissues of the Prime toy would take, though Roller stills fluctuates back and forth between grey and dark blue, depending on how show-accurate each reissue wants to be.
Part of the first wave of Bot Shots Series 1 single-packs, Optimus Prime is a teeny little long-nosed semi truck with "trailer", with a spring-loaded automatic transformation to robot mode triggered when his front bumper is pressed. He has a "spinner" in his chest that shows his three attack types and power levels. His truck mode and robot body are influenced by the live-action Optimus Prime, while his head is taken from the original. His blue paint is light and sparkly-metallic, his red paint is dull matte, and his optics are yellow.
Voyager figures all feature a spring-loaded MechTech-style transforming weapon, partially constructed from translucent plastic, which lights up via LED when the weapon is deployed. The figures themselves also feature translucent plastic, so the moving LED creates the image of energon power "flowing" from the character's bodies into their weapons. This worked better in theory than in practice. Internally, these figures were referred to by Hasbro as "Powerizers".

I have to disagree. Look at our planet. Jagged and rigid is an aspect of primitive technology. Smooth, compact, and protected is an aspect of futuristic technology. Transformers should look more advanced than what we hsve, nor technologically regressive. They have better scientists and millennia of knowledge compared to us. Smooth designs like Knight's are the only ones that make realistic sense in that context of technological progression, even as a life form.
Part of the first wave of Bot Shots Series 1 single-packs, Optimus Prime is a teeny little long-nosed semi truck with "trailer", with a spring-loaded automatic transformation to robot mode triggered when his front bumper is pressed. He has a "spinner" in his chest that shows his three attack types and power levels. His truck mode and robot body are influenced by the live-action Optimus Prime, while his head is taken from the original. His blue paint is light and sparkly-metallic, his red paint is dull matte, and his optics are yellow.
For reasons unknown, his ion blaster was sculpted with a large, rectangular handle, requiring accommodating fists. In order to make use of the other weapons in the line (like his own rocket launcher and the solitarium weapons), he comes with an extra pair of replacement fists with smaller, circular peg-holes. This replacement-fist method is also used to plug in his clear-plastic energy axe.

Prime comes with all the accessories of his previous release, although his ever-changing ion blaster is now somewhat confusingly cast in blue plastic. He features one major additional accessory: an electronic display base sculpted with the image of the Matrix and the Autobot insignia. Pressing the insignia's crest triggers a series of electronic soundbytes, mostly quotes from the movie recited not by original actor Peter Cullen, but by Hasbro's in-house actor, Ron Hayden: "Autobots, transform and roll out!", "I want you to make a special run to Autobot City," "Megatron must be stopped!", "All we need is a little energon, and a lot of luck," and two samples of the classic transformation sound effect, one ascending, one descending.

Optimus was made available as a mail-away toy in the "Digital Doom on the Highway to Destruction" offer in the US in 1986 to coincide with the Transformers movie in 1986. He cost $21.50 and 5 robot points, and came with a special Movie Edition Certificate and a round sticker that read " Movie . Edition . Transformer" with the Autobot symbol in the middle. (This item is considered rare.)

He made it out of the building and ran into the real Sunstreaker, who blasted the 2 clones following Hot Rod. Sunstreaker ignored Hot Rod's warning about Scorponok's army and stormed into the building so Hot Rod painfully wired himself to send a distress signal. When Sunstreaker's real head was later disabled by Hunter, the Headmaster clones shut down, which Hot Rod explained to Grimlock. The group was surprised by the arrival of Shockwave, but Ultra Magnus had heard Hot Rod's distress call and was on his way to Earth. After Scorponok knocked out Sludge and Grimlock tended to him, the remaining Dynobots offered Hot Rod a lift aboard the Monsterbots' ship. He refused though, and made it back into Machination HQ to take care of something "personal". He eventually found Scorponok's real head. Hunter also showed up and let Hot Rod know how to disable it, but before he could do so, Scorponok grabbed him. Before Scorponok could crush Hot Rod's head, the Dynobots showed up and began to battle Scorponok. Hot Rod told Swoop which wires to sever, and he did just that, reducing Scorponok to a catatonic state. Ultra Magnus arrived took everyone back aboard his ship, which later docked with the Ark-32. Within 3 days, Hot Rod was fully repaired, with a new body form design.
TakaraTomy released another reissue based on the Encore version as part of their Chronicle line in 2011, lacking the original Generation 1 trailer. Instead, the Chronicle version was available in a two-pack with Dark of the Moon Deluxe Class Optimus Prime and a new trailer that could be used by both Optimuses, thanks to a retooled trailer hitch on the Generation 1 Optimus Prime figure.
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