Engine Room

The Engine Room is a Dome in Super Mario Galaxy. It is the fifth accessible Dome, and will be unlocked whenever Mario recovers the Grand Star from Bowser's Dark Matter Plant.

On the exterior, the Engine Room looks simply like a large metal dome. Inside, however, are purple and blue pipes leading up from a steel mesh floor. A Gearmo patrols the room, although he serves no real significance. As with all Domes, the Engine Room has a Pull Star in the center, which is used to access the Dome's Galaxies.

The main boss of the Engine Room is King Kaliente.

Galaxies

 * Gold Leaf Galaxy
 * Sea Slide Galaxy
 * Toy Time Galaxy
 * Bonefin Galaxy
 * Bowser Jr.'s Lava Reactor
 * Sand Spiral Galaxy (Hungry Luma)

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almost everything in the engine room has something from a different galaxy. Some people even call it the biggest rip off in video game history.... which is not true.