Unicron (Colman Domingo), a planet-eating demon, has sent his minion, Scourge (Peter Dinklage), to find the Transwarp Key which will allow him to continue devouring the universe.  Centuries ago, the key was entrusted to Optimus Primal (Ron Perlman), son of Apelinq (David Sobolov), leader of the Maximals, who fled to Earth and hid the technology…