Quick recap
On Cybertron, Elita-1 infiltrates a Decepticon fortress and finds Ultra Magnus, tortured for years by Shockwave. She resents Optimus for leaving in the Ark mid-war. Shockwave uses a space bridge to bring Cybertron to Earth and drain the planet's resources. On Earth, Spike considers running off with the Autobot Beachcomber but decides to stay and fight. Wheeljack wins over Skywarp to teleport the team to the Decepticon base, and Ultra Magnus rejoins the fight, only to freeze at the sight of his torturer. In the end, Optimus faces Shockwave, who appears to die, and gives up a chance to save Cybertron in order to protect Earth.

