Optimus Prime Day
September 7th is a day that Transformers fans, adopted as it is a somber occasion commemorating the death of Optimus Prime in The Transformers: The Movie (1986). According to many fans, that was one of the best fights in Transformer’s history.
Optimus Prime is a fictional character created by the Transformers franchise. He is a Cybertronian, a fictional extraterrestrial species of sentient self-configuring modular robotic lifeforms (e.g.: cars and other objects), a synergistic blend of biological evolution and technological engineering. In almost every version of the mythos, Optimus is the leader of the Autobots, a faction of Transformers who are rivals of the Decepticons, another faction.
In the current series of live-action films, starting with Transformers (2007), Optimus Prime converts to a Peterbilt 379 semi-tractor or a Western Star 5700 Concept semi-tractor.