Robot Generator

"According to my calculations, if the Robot Generator isn't stopped by sunrise tomorrow, there will be a giant explosion."

- Dr. Robotnik.

The Robot Generator (エッグジェネレータ Eggu Jenerēta, lit. "Egg Generator") is a device made by Doctor Robotnik that generates all of Robotropolis' energy, also being located in the city and was guarded by Metal Robotnik after he took over the place.

Welcome to Eggmanland
When Sonic and Tails arrive at the presidential house, they instead see Robotnik, who gives the two a mission. He explains how Metal Robotnik took over his city and how Metal Robotnik sabotaged the generator, which creates the voltage for the entire city. If the generator will not be stopped, a giant blast will occur, possibly destroying Planet Freedom with it, and it is Sonic's duty to prevent it from doing so.

Sonic VS. Metal Sonic!!
Once the duo arrive at the core of the city, alongside Knuckles, They enter, seeing the generator overloading and having a timer ticking down at 20 seconds. Sonic runs off to it and finds himself stuck on an conveyor belt to the generator, Tails then bumps into him. Sonic suggests Tails to fly, but when he tries, the switch to shut it off is too heavy. Sonic struggles to keep up as the generator comes closer to an explosion. Knuckles bursts out a wall, gliding to the generator, but Sonic already switched it off just before it blows up.

The conveyor melts down, and strangely traps Sonic in a green box-shaped cage, collecting it's life data for his replica: Hyper Metal Sonic. The lights of Robotropolis shut off, Tails flies up too the cage, analyzing it. It eventually collapses and Sonic starts to fall. Knuckles luckily grabs him from hitting the ground. The generator's parts all fall into the abyss.

Appearance
The Robot Generator is a gray generator with a mimic to Dr. Robotnik's face. It has a conveyor belt and is attached to the building.