Season 1

Episode 6. Divide and Conquer
Episode 7. Fire in the Sky

6. Divide And Conquer

Optimus Prime is injured in a battle with Starscream, Skywarp, and Thundercracker of the Decepticons. In order to repair his body, the Autobots need a cosmotron. The only problem is that there isn't one on Earth. Ironhide, Trailbreaker, Bluestreak, Bumblebee, and Chip have to go to Wheeljack's old workshop on Cybertron via the space bridge to get the cosmotron for Optimus. The Decepticons show up to produce acid rain to short out the Autobot's circuitry. Trailbreaker and Bluestreak get rid of the rain makers and make it back to Earth. Back on Earth, Megatron and the Decepticons decide to attack the Autobots while Optimus Prime is down. The Autobots fight back, but are easily defeated until Optimus Prime returns to fight Megatron in a one on one battle. Megatron used up too much power fighting the Autobots and is beaten by Optimus and the Decepticons retreat.

7. Fire In The Sky

The Decepticons next plan is to drain the heat energy from the Earth's core. The entire world is starting to freeze rapidly. While they are working in the arctic, the Decepticons find a large robot stuck in the ice. They thaw him out and it turns out to be a robot that Starscream knew a long time ago back on Cybertron. His name is Skyfire (first appearance). Megatron tells Skyfire that they are working to bring energy back to Cybertron. He tells Skyfire that the Autobots are evil and that they must be destroyed. Skyfire joins the Decepticons, but after he learns how the Decepticons treat humans, he joins up with the Autobots. Skyfire and Starscream have a fight to the finish. Skyfire wins, but he crashes and is trapped under an avalanche. The Autobots stop the energy drain and the Autobots mourn the loss of Skyfire.