04 - "Fire in the Sky"

  The Decepticons are in the Arctic, tunneling into a huge, hollow crystal shaft found under the ice to drain heat energy from the Earth's core. This will also cause the planet to completely freeze over. While digging new tunnels, Megatron discovers Jetfire--a huge robot scientist from Cybertron, buried in the ice for millions of years. Jetfire is revived and is relunctantly initiated into the Decepticon ranks. When the Autobots go to the Arctic to confront  the Decepticons, Jetfire gets involved and learns where his true loyalties should lie. He helps defeat the Decepticons--especially his old "friend," Starscream--but is buried by an avalanche he caused to cover the crystal shaft and mining tunnels.


05 - "S.O.S. Dinobots"

  Tremors within the volcano headquarters of the Autobots expose a previously-unknown chamber containing large fossils of dinosaur bones. Wheeljack and Ratchet construct three Autobots that can transform to dinosaur modes. Meanwhile, the Decepticons, hoping to acquire a perpetual source of electrical power, take over a great waterfall system. When the Dinobots are finished, their simple brains prove faulty, and the three creatures go berserk. Optimus, considering them too dangerous, orders them shut down and sealed away froever. When the Autobots go to the falls to stop the Decepticons, they are ambushed. Wheeljack improves the Dinobots against Prime's orders, and--now substantially improved--help rescue the Autobots and drive off the Decepticons.