When animating the scene in which Primal removes Prime's spark, Mainframe's animators consulted The Transformers: The Movie for reference on the interior of Prime's chest. Not realizing the importance of the Matrix of Leadership, they rendered it as a container for Prime's spark. Beast Wars writers Larry DiTillio and Bob Forward have since claimed that in their view, Prime had not received the Matrix from Alpha Trion at this point, but a later comic produced for Botcon indicated that the Matrix was in fact stored in a secondary compartment, hidden behind Prime's spark. In this particular comic, the alien Vok used the Matrix, the Transmetal Driver, and a control suit once piloted by the Predacon Quickstrike to create Primal Prime.
Optimus Prime returns in Transformers: The Last Knight, which is set three years after the events of the previous film. Having been frozen in the vacuum of space, Optimus has been drifting on the far reaches of Earth's solar system for some time. However, he later crash-lands on Cybertron, its atmosphere reviving him. He then confronts the being currently in control of the planet, a powerful sorceress named Quintessa, who professes to be the maker he is searching for. Optimus is easily subdued by Quintessa, who convinces him that he destroyed Cybertron and reveals that the Earth is actually Cybertron's "ancient enemy" Unicron. Redubbing him "Nemesis Prime", Quintessa brain-washes Optimus and tasks him with retrieving her stolen staff, with which she plans to drain Earth/Unicron's life force so that Cybertron can be restored. Nemesis succeeds in retrieving the staff, but is hindered by Bumblebee, whom he engages in a fierce duel. Nemesis nearly kills Bumblebee, but when the normally mute Bumblebee suddenly speaks, urging Prime to remember who he is, the sound of his oldest friend's voice is enough for Optimus to return. However, Megatron, revealed to be in league with Quintessa, swoops in and steals the staff from Optimus. Prime is then attacked and sentenced to death by the Guardian Knights for aiding Quintessa, but he is saved by Cade Yeager, who convinces Optimus to correct his mistake. Optimus leads the Autobots in the attack on Quintessa's lair, during which he slays the Infernocons and defeats Megatron. Optimus then attacks Quintessa, distracting her long enough for Bumblebee to shoot and seemingly vaporize her. At the end of the film, Optimus and the other Autobots return to Cybertron, unaware that Quintessa is actually still alive.
Part of the first wave of Prime: Robots in Disguise Weaponizer Class toys, Optimus Prime is a large toy, similar in size to Leader Class figures from previous Transformers toylines. He features a simpler transformation and design compared to previous Leader-sized figures, with him having fake chest windows (again) and a simplified, hollow truck rear where his feet, arms, and fake chest windows are plainly visible. He comes with a blaster which can mount onto his hands, shoulder-pads, and the sides of his legs/truck rear.
The U.S. release of Super Fire Convoy had the Japanese voice replaced with an English voice (with the lines, "Optimus Prime, Maximize!" and "Autobots, Transform"), and Autobot insignias were added on the side panels. Much like the Japanese version, Optimus Prime's normal robot mode can combine with Ultra Magnus (sold separately) to form Omega Prime.
The use of a G1-based Orion Pax design and an Aligned-based Optimus Prime design with Movie Optimus Prime packaging art makes it hard to know where on the wiki this should go, but given the general movie-themed bent of the Tribute line, we're putting it here. Continuing the tradition, the 2-pack was first released in some Asian countries like Taiwan without any prior announcement from Hasbro itself. A few months after the 2-pack's release, Tribute Optimus Prime & Orion Pax saw worldwide release through Amazon, including an Amazon Japan listing bearing a The Last Knight ID number.
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.