Bowser Jr.'s Robot Reactor

"Wahahaha! You made it! But I won't even need my dad's help to take care of you!"

- Bowser Jr.

Bowser Jr.'s Robot Reactor is Bowser Jr.'s first galaxy in the game Super Mario Galaxy. In it, Mario fights Megaleg to earn a Grand Star.

Planets
NOTE: Unless otherwise marked, all names are unofficial.

Starting Planet
This is a very small planet. Mario is required to entice a Bullet Bill to follow him and break open a cage to reveal a Launch Star, and then use that Launch Star to reach the Robot Reactor. This metal planet has a Black Hole that Mario needs to avoid. There are also other cages that can be broken to reveal coins or a 1-Up Mushroom. It is also infested with several Goombeetles, which make it slightly harder to traverse the narrow pathways while being pursued by a Bullet Bill. There is an odd shortcut on this planet. If the player Triple Jumps off the cage with the Launch Star and Spin they can reach Megaleg faster.

Robot Reactor
This is where Megaleg is found and battled. It is fairly small and orange-brown, with many technologic symbols all over it. It has small rectangular areas on it that are transparent and seem to have computer components inside them. Despite Megaleg's probable immense weight, the transparent panels never break if Megaleg stomps on them, all that happens is a cloud of dust rises up. In the underside, there are several glass containers around the back of the planet that can be destroyed with the help of Bullet Bills for items. It orbits the starting Planet.

Mission
This galaxy consists of only the following mission.

Trivia

 * If the player goes to the top of Megaleg and use the first person view to look at the starting planet, the player will see that it looks like its grassy beta appearance, instead of being metallic. This can also be seen after Megaleg is defeated.
 * Around the square panel on the base of the Tech planet where the glass cages are, the so-called technological symbols are S-Block Tetriminoes in different orientations. This is a reference to Tetris, which is another game franchise owned by Nintendo.
 * If players go to the back leg, they find a 1-Up.
 * If the player defeats Megaleg and goes to the planet on the Terrace map, it will show Megaleg on the Metallic planet instead of Bowser's face.

Robo-Impianto di Bowser Jr. Bowser Jr.s Robofabrik