Prime was perpetually at the forefront of the action throughout the early years of the war on Earth, usually confronting Megatron, though in some rare instances, such as against the Insecticon-controlled Decepticons or the Combaticons, teaming up with him for the greater good. He has suffered his fair share of battlefield scrapes, almost meeting his end when his vital cosmotron component was critically damaged by the Decepticon jets and when Laserbeak had his body disassembled and turned into Decepticon trophies, such as a pet "alligaticon" and a defense laser.
During the war, Optimus was killed in battle by Megatron, but was eventually resurrected. The Fight Begins Coming to the dire realization that the war against the Decepticons had become a never-ending arms race, Optimus Prime challenged Megatron to single-combat, with their troops acting as witnesses to their terrible and final clash. The battle between both faction leaders ended with Megatron beaten down and goading Optimus into delivering the kill shot...
He now comes with a half-translucent gun which lights up and expands MechTech-style when the lever is pulled. Bizarrely, the main section of the weapon is sculpted to resemble Prime's forearm, with the unfolding part being his in-show gun. Additionally, he comes with an opaque sword resembling the Star Saber, which he can wield two-handed. The gun features a peg on its underside and a port on each side, while the sword features a peg and peg-hole on its hilt in addition to its 5mm handle. In robot mode, either accessory can mount on his hands, on either of his shoulders, or be pegged into either of his half-translucent forearms. In vehicle mode, the top of the vehicle mode cab can also fold back to reveal two additional peg holes, and there are three peg holes (including the fifth wheel hitch) on the back section, although the hitch tends to open up and not hold very well.
Released as part of the Bumblebee Energon Igniter's Speed Series line, this Optimus is a Legends/Legion-sized mold that transforms from robot into a Cab-over truck with the transformation scheme shared with the Transformers (2010) Reveal The Shield Legends Class toy, and he features 3mm compatible hands. Optimus' truck mode can also be attached with the Energon Igniters core, and due to the toy being lightweight, it can propel his vehicle mode forward very quickly, making him a fast-moving truck. Due to its simplified transformation, Optimus' robot shoulder parts ended up sticking out from his truck mode, and his upper cabin panel ends up being integrated with his head. Unlike most Speed Series toys, his Energon Igniter port is ends up under his right foot in robot mode rather than on his knee.
In the third nexus, Optimus oversaw Ironhide testing Sparkplug's latest invention, the Sun-Pak, a miraculous device capable of fuelling a Transformer for an entire Earth day after being charged for only an hour in sunlight. As the trial-run wound down to an end, the Decepticons suddenly burst into the Autobots' secret underground testing facility, forcing Optimus to decide whether to order a tactical retreat, or have his Autobots fight the intruders despite his troops' low energy reserves. If he chose to stand and fight, he had the additional choice to either make the Autobots concentrate on Starscream, who is leading the charge against the Autobots, or divide his troops' attention onto all of the Decepticon assailants. If Optimus chose to attempt to eliminate Starscream once and for all, the Decepticon Seeker would beg for mercy, forcing Optimus into a choice yet again: accept the snivelling Decepticon's surrender, or continue his attempt to end Starscream's evil once and for all. Accepting Starscream's surrender spells victory for the Autobots, whereas ignoring Starscream pleas ultimately leads to Sparkplug being kidnapped by the Decepticons, necessitating Optimus to send Buster, Blaster and Bumblebee on a perilous retrieval mission while the other Autobots recharge at the Autobots' home base.
As leader of the Autobots, Prime headed up their mission to search for new sources of energy to revitalize the depleted Cybertron. Optimus vowed to Elita that he would return from his mission for her, but just before the launch of the Ark, Optimus was mistakenly led to believe that Elita was killed. Shortly after its launch, the Autobots' craft was attacked by the Decepticons' space cruiser, the Nemesis, and boarded by Megatron and the Decepticons. In the ensuing struggle, the G-forces of a nearby planet pulled both craft down, and the Autobots' ship crashed into a volcano, thrusting all the occupants into emergency stasis. Four million years later, in the Earth year 1984 A.D., a volcanic eruption jarred the ship's computer, Teletraan I, back to life. The computer reactivated the Decepticons, programming them with new Earth-based disguise modes. As a parting gesture, Starscream fired upon the Autobot ship, creating a landslide. The vibrations from that landslide knocked Prime into the path of the computer's restoration beam, restoring him to life, thus beginning the war anew on Earth.
In robot mode, like Combat Hero Prime, the bottom of the truck became his familiar windowed chest based upon the original Optimus Prime toy. His main gimmick was light up LED headlights, and a lightpipe in the bottom of his right fist, illuminated by an LED in his right forearm, that would illuminate his clear sword or his double-barreled rifle if they were used in that hand. All three LEDs were activated simultaneously by pressing the sunroof-like depression on the roof of the truck.