Optimus foiled Megatron's attack on 21st century Tokyo after informing his old foe that wherever he would pop up, the Autobots would be there to thwart his evil intentions. Henkei! Henkei! volume 1 Optimus and Bumblebee later intervened when Astrotrain attacked Shinjuku Station, using their bodies to shield nearby humans from the destruction the triple-changer brought about. They were unaware that Astrotrain's rampage was really a distraction staged to keep their attention away from Megatron's gathering of energon cubes nearby. Henkei! Henkei! volume 2 Optimus continued to do battle against Astrotrain until Rodimus showed up to provide the Autobots with additional firepower. Henkei! Henkei! volume 3


After many battles on Earth, Optimus died by standing purposefully in the path of the Hydra-Cannon built by Megatron from the three Mini-Con weapons, the Star Saber, the Skyboom Shield, and the Requiem Blaster. He managed to partially reflect the beam, damaging the Hydra-Cannon. It was the Mini-Cons themselves, however, who resurrected him, entering the Matrix and reconstructing a new body for him. Subsequently, Unicron forced Optimus to face the dark part of his soul and that, on some level, he enjoyed the thrill of combat. Following Unicron's defeat, Optimus's denial was sorely tested as Galvatron, an upgraded Megatron, forced him into one final furious battle. The battle ended when Starscream sacrificed himself to end the circle of hate that powered Unicron. Floating through space, Optimus found the Matrix, but said he did not deserve it. Before beginning the battle with Galvatron, he was upgraded by the minicons. His red torso turned black and he was able to battle Galvatron one on one.

According to the bio printed in the Transformers Collectors Club magazine, Optimus Prime was a member of the Cybertron Dimensional Patrol, but was abducted by Unicron. It is unknown whether he repainted himself yellow before being abducted or if the recoloration was due to the radiation emanating from Unicron, which has a tendency to recolor Cybertronians.
A Japanese-exclusive, the final new-design G1 Convoy toy was a departure from previous versions. He now transformed into a small extended hood cab truck of made-up model pulling an implausibly large trailer equipped with motorized caterpillar treads. The trailer could additionally pull along the auxiliary trailer transformer Grandus, on which the shuttle Sky Garry could land, forming the spaceship "Battlestars". Even without combining, Star Convoy's truck mode was a behemoth, including a Micro Trailer semi as a small accessory and an upgraded Roller that was now patterned after a tracked ballistic missile carrier.
Armor Knight Optimus Prime is a retool of Age of Extinction: Generations Leader Class Optimus Prime. It features a new head sculpt with a rotatable faceplate (one side with the mask, the other without, the whole part rotates), along with other remolded body parts (such as his skirt, feet, and chest), giving it a more screen accurate appearance. He includes more movie-accurate weapons, featuring a new sword and shield, albeit in not-so-accurate colors (the sword's transparent orange blade was also a nod to the sword's "heat up" mode in the concept art.). He is covered in metallic paint, along with additional chrome details on his rims and bumper.
Hot Rodimus also appeared in the Japanese exclusive Kiss Players storyline. In the alternate timeline of Kiss Players, Hot Rodimus has given up the Matrix to Ultra Magnus after his actions in hurling Galvatron out of Unicron's body resulted in the Decepticon leader crashing into and devastating Tokyo, rather than landing on Thrull, as seen in the original continuity. He subsequently came to Earth to try to repair relations with the humans, but was instead attacked and nearly killed by a Legion Creature, a hybrid created from Galvatron's Unicron-corrupted cells fusing with local creatures. He was saved by a kiss from the human Li Shao-Shao and reformatted into a body resembling a Ford GT. He went on to battle the Earth Defense Command (an anti-Transformer organization), the Legion - and Optimus Prime himself. Prime had been resurrected in a Kiss Player body, but Hot Rodimus, believing his commander to be dead, thought it was a trick.
While Beast Machines was still running in Canada, Japan's Takara made a bid to return to the familiar vehicle-transforming robots concept. In 2000, Car Robots was released. This line was brought by Hasbro to America as the Robots In Disguise series, and featured the Autobots facing off against the Predacons. This series is usually regarded by most as filler while Hasbro contemplated the next direction for Transformers. However most fans of Transformers recognise that most if not all of the toys released from this line were of excellent quality (with the Optimus Prime and Ultra Magnus figures gaining considerable praise), combining the ball-joint articulation with detailed, well painted alternate modes.
The TakaraTomy "Autobot Alliance" release of this toy has some significant differences, including casting the red plastic in a darker shade, making his shin and wheel joints grey rather than Hasbro's bronze, painting the Matrix of Leadership silver, and swapping out the dual energon swords for battle hooks, similar to 2010's Leader class Optimus Prime. However, due to the Japanese release retaining the Hasbro packaging, the box still advertises the dual energon swords rather than the hooks. He retains the masked face used for the Hasbro release. 
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