Quick recap
After the Decepticons' defeat, Soundwave is captured and the Autobots ally with U.S. government forces. Thundercracker defects from the Decepticons to Optimus's side. Wheeljack finds a fossilized T. rex skeleton in the caves under the Ark. The Decepticons rescue offline comrades from the Ark, Megatron kills Trailbreaker by consuming his spark, and Soundwave is freed. Elita-1 returns from Cybertron and asks Optimus to help the Autobots there; he refuses, since the war they brought threatens Earth. Elita tries to tear the Matrix from his chest, and Optimus releases it to choose for itself: it picks Elita, who becomes Elita Prime. The Autobots split peacefully, half to Cybertron and half staying on Earth.
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