Transformers: Scramble City

The Autobots are secretly building Scramble City, a mobile fortress meant to strengthen Earth's defenses, with Ultra Magnus overseeing the project. When the Decepticons learn what is being constructed, Megatron sends his combiner teams to destroy it before it can be completed.

The attack erupts into a clash of giant combined warriors, with the Aerialbots and Protectobots answering the Stunticons and Combaticons. As both sides reveal new machines that can reconfigure and combine in different ways, the battle becomes a race to determine whether Scramble City will ever have the chance to enter the war.