Here it is, the final trailer for the showdown between Optimus Prime and the rest of the gang in Transformers: The Last Knight. Will he find be able to find his way back to his family? 

Optimus Prime finds his home planet, Cybertron, now a dead planet, in which he comes to find he was responsible for killing. He finds a way to bring the planet back to life, but in order to do so, he needs to find an artifact, which is on Earth.