Giant

Optimus and the Autobots advance to Giant Planet in the starship Aegea. On the way, there is a reaction on the thermal sensors of the radar, which reveals the presence of a planet. After finding Gigantion, they find that massive cities on the surface and those bits of the planet were torn off and made to form a ring. Searching the entire city, Safeguard brings them to a rock blocking an underground tunnel. After scratching and blasting, the Kids and the Mini-Cons found a station that has been abandoned. Safeguard explains that the people of Gigantion build cities then abandon them. Once again searching, Scattershot found huge tremors that lead the Autobots right to a construction site. One of the workers accidentally dropped a big girder which was crushed Landmine. Then a big Transformer came in and saved him. Introducing himself as Metroplex, the Autobots ask him about the Cyber Planet Key. Metroplex's friend Quickmix says that the Key is at the center of the planet. Unfortunately, no one can go back to the abandoned cities and the Autobots must respect their traditions. Suddenly, while the Autobots are trying to motivate Metroplex and Quickmix to help them retrieve the Cyber Planet Key of Giant Planet, a worker came in saying that a miscreant named Menasor was wreaking havoc. It was then revealed that Menasor had joined Megatron, hoping to get better respect from the Decepticon Leader. During a battle, Metroplex went against Megatron and used his buzz saw to send Megatron down three levels and Nemesis Breaker into smoke. The Decepticons retreat and Metroplex and Quickmix join the Autobots. Tradition or no tradition, they couldn't let Megatron get his hands on the Key.