Five more episodes featuring the original robots in disguise. In ' Fire in the Sky' the Decepticons find a Transformer frozen in the ice at the North Pole. 'SOS Dinobots' sees the Autobots discover dinosaur bones in their cave. ' Countdown to Extinction' has the Transformers come to the rescue when Starscream tries to explode the Earth. 'A Plague of Insecticons' finds the Decepticons joining forces with the Insecticons & attempting to steal oil from a refinery. Finally, in ' Heavy Metal War', Megatron & Optimus Prime engage in a deadly duel, the outcome of which will effect the Autobots' future on Earth.