S1, E4: Presumed to be defeated, the Decepticons have returned! After receiving a message from Shockwave on Cybertron, Megatron comes out of hiding and orders the construction of a "Space Bridge" to transport Earth's energy to Cybertron. When Bumblebee and Spike uncover his plan they are captured, and Bumblebee is "reprogrammed" to lead the Autobots straight into a trap!