 Optimus Prime, Wheeljack, and Jazz arrive on the planet Zel, looking for a missing Autobot search team that disappeared on the planet while looking for a mysterious UFO.After being lured out of their ship by Soundwave, Megatron steals their ship's supply of Energon.The Autobots proceed to defend the planet from the Decepticons, who are raiding all of the planet's energy resources.