Bowser Jr.'s Lava Reactor

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Bowser Jr.'s Lava Reactor
Bowser Jr.'s Lava Reactor in the game Super Mario Galaxy.
Area Engine Room
How to unlock Have 45 Power Stars
Mission(s) King Kaliente's Spicy Return
Stars A Grand Star icon from Super Mario Galaxy.
Galaxy icon Bowser's head (before completion)
The Starting Planet and the Lava Reactor (after completion)
“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. The Japanese name implies it is used for making monsters.


NOTE: Unless otherwise noted, all names are unofficial.

Starting Planet[edit]

The Starting Planet.

This planet is small, made of dirt and is half-gone with a black hole in its core. 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[edit]

SMG Lava Reactor Green Platforms.png
A subsection before King Kaliente.
SMG Lava Reactor Kaliente Arena.png
The planet from above.

The Lava Reactor[1] is a large star-like entity 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.



This galaxy contains only the following mission.

Level Image Summary
King Kaliente's Spicy Return Kalientereturn.png This mission's objective is to defeat King Kaliente.

Names in other languages[edit]

Language Name Meaning
Japanese クッパJr.クリーチャープラント
Kuppa Jr. Kurīchā Puranto
Bowser Jr.'s Creature Plant

Chinese 酷霸王Jr.生物工厂
Kùbàwáng Jr. shēngwù gōngchǎng
Bowser Jr.'s Biology Plant

French (NOE) Usine de créatures
Creature plant
German Kreaturenfabrik
Creature Factory
Italian Mondo Torrido di Bowser Jr.
Bowser Jr.'s Torrid World
Korean 쿠파주니어 래버 리액터
Kupajunieo Raebeo Riaekteo
Bowser Jr's Lava Reactor

Spanish (NOA) Dimensión de Bowser Jr.
Bowser Jr.'s Dimension
Spanish (NOE) D. de Bowsy y sus Huestes
Bowser Jr and his Army's Dimension


  • There is a glitch in this galaxy where one can triple jump onto the cage with the 1-Up Mushroom on the Starting Planet and Star Spin at the height of the jump to actually fall on to the Lava Planet, similar the one in Bowser Jr.'s Robot Reactor; However, unlike the latter when the player lands on the solid planet where Megaleg was, since Mario or Luigi will fall nowhere near where the launch star would take him, the player has no choice but to lose a life by bouncing on the lava.[citation needed]


  1. ^ Black, Fletcher. Super Mario Galaxy PRIMA Official Game Guide. Page 249.