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 and attempting to steal oil from a refinery. Finally, in 'Heavy Metal War', Megatron and Optimus Prime engage in a deadly duel, the outcome of which will effect the Autobots' future on Earth.