I Am Optimus Prime (Attack on Titan)

What if Optimus Prime was sent to the world of Titans instead of Sam's world?

In this alternate reality, the Autobot leader Optimus Prime is transported not to Earth to meet Sam Witwicky, but to a terrifying world overrun by man-eating Titans. Stranded in a place where humanity fights for survival within massive walls, Optimus must decide: will he stand aside or rise to become a symbol of hope for a dying world? As new alliances form and old values are tested, the clash between steel and flesh begins.