Bowser Jr.'s Lava Reactor
- “If I give up any more Grand Stars, my dad's gonna get MAAAAAAD! So this calls for my ultimate weapon! Give 'em some heat, King Kaliente!”
- —Bowser Jr., Super Mario Galaxy
Bowser Jr.'s Lava Reactor is a Bowser Jr. galaxy in Super Mario Galaxy. This is where Mario battles King Kaliente for the second time and receives a Grand Star. The galaxy is an extremely large planet made out of lava with very few rocks.
Planets/Areas
NOTE: Unless otherwise noted, all names are unofficial.
Starting Planet
This planet is small, made of dirt and is half-gone. There are several Goombas and one Bullet Bill launcher. There are also several cages that can be broken by a Bullet Bill that contain items such as coins, a 1-Up Mushroom and a Launch Star.
Lava Reactor
This star-like entity is large and is made up solely of lava. There are several sinking platforms around its northernmost region in a circle formation, with more sinking platforms in a path-like formation across its southernmost region. This planet is home to King Kaliente and is where Mario fights him for the second time.
Enemies
Mission
This galaxy contains only the following mission.
| Level | Image | Summary |
|---|---|---|
| King Kaliente's Spicy Return | 
|
This mission's objective is to defeat King Kaliente. |
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | クッパJr.クリーチャープラント[?] Kuppa Jr. Kurīchā Puranto |
Bowser Junior's Creature Plant | |
| Chinese | 酷霸王Jr.生物工厂[?] Kùbàwáng Jr. shēngwù gōngchǎng |
Bowser Junior's Biology Plant | |
| German | Bowser Jr.s Kreaturenfabrik[?] | Bowser Jr.'s Creature Factory | |
| Italian | Mondo Torrido di Bowser Jr.[?] | Bowser Jr.'s Torrid World | |
| Spanish (NOA) | Dimensión de Bowser Jr.[?] | Bowser Jr.'s Dimension | |
| Spanish (NOE) | Dimensión de Bowsy y sus Huestes[?] | Bowser Jr and his Army's Dimension |
Trivia
- There is a glitch in this galaxy where one can triple jump on to a cage with a 1-Up Mushroom on the Starting Planet and Star Spin at the height of the jump and actually fall on to the Lava Planet, similar the one in Bowser Jr.'s Robot Reactor; However, unlike the latter when the player land on the solid planet where Megaleg was, since Mario or Luigi will fall no where near where the launch star would take him, the player has no choice but to lose a life by bouncing on the lava.
