| Bowser Jr.'s Robot Reactor | |
|---|---|
| |
| Area | Terrace |
| How to unlock | Get 8 stars |
| Boss(es) | Megaleg |
| Mission(s) | Megaleg's Moon |
| Music track(s) | A Tense Moment Megaleg |
| Stars | 
|
| Galaxy icon | Megaleg on the Robot Reactor |
- “Wahahaha! You made it! But I won't even need my dad's help to take care of you! Go at 'em Megaleg! Stomp 'em with the power of your Grand Star!”
- —Bowser Jr., Super Mario Galaxy
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
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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. If players go to Megaleg's back leg, they find a 1-Up Mushroom. The Robot Reactor orbits the starting planet.
Enemies
Megaleg (boss)
Mission
This galaxy consists of only the following mission.
| Level | Image | Summary |
|---|---|---|
| Megaleg's Moon | 
|
Mario must battle and defeat Megaleg to obtain the Grand Star of the Terrace. |
Gallery
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | クッパJr.ロボプラント[?] Kuppa Junia Robo Puranto |
Bowser Jr.'s Robo-Plant | |
| Chinese | 酷霸王Jr.机器人工厂[?] Kùbàwáng Jr. jīqìrén gōngchǎng |
Bowser Jr.'s Robot Factory | |
| German | Bowser Jr.s Robofabrik[?] | Bowser Jr.'s Robo-Factory | |
| Italian | Robo-Impianto di Bowser Jr.[?] | Bowser Jr.'s Robo-Plant | |
| Korean | 쿠파주니어 로봇 플랜트[?] Kupa Junieo Robot Peullaenteu |
Bowser Jr.'s Robot Plant | |
| Spanish (NOA) | Dimensión Robot de Bowser Jr.[?] | Bowser Jr.'s Robot Dimension | |
| Spanish (NOE) | Dimensión Robot de Bowsy[?] | Bowsy's Robot Dimension (Bowsy is Bowser Jr.'s Spanish name in Europe) |
Trivia
- If the player uses the first person view from Megaleg's moon to look at the starting planet, the player will see that it looks like its grassy early appearance, instead of being metallic.