A chance encounter in a sandstorm leads Optimus, Elita, and Bumblebee to Ron - a lone survivor hiding more than just scrap metal. When a strange creature begins to hunt them, the truth about Ron's past may change everything.

Out of Energon and out of luck, Optimus and his team jump at the chance to recharge! ... but instead, they're dragged into a dark and twisted Trick or Treat challenge!