Bowser's Star Reactor

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Bowser's Star Reactor
Bowser's Star Reactor in the game Super Mario Galaxy.
Area Fountain
How to unlock 15 Power Stars
Boss(es) Bowser
Mission(s) The Fiery Stronghold
Stars A Grand Star icon from Super Mario Galaxy.
Galaxy icon Bowser's head
Not to be confused with Bowser's Galaxy Reactor.
“BWAHAHAHA! You finally made it! Just in time for me to stomp you into space bits!”
Bowser, Super Mario Galaxy

Bowser's Star Reactor is a galaxy located in Super Mario Galaxy and the first galaxy where Mario fights Bowser. Before that, he has to travel through a short level. The galaxy has lots of inaccessible Airships floating in the background; these can only be reached by hacking the game, which reveals they are solid. The theme is a remix of Bowser's Road from Super Mario 64.


NOTE: Unless otherwise noted, all names are unofficial.


At least eight airships are flown past when approaching the galaxy. These are never traversed, however. They can also be seen in first-person mode in the background from later planets.

Starting Planet[edit]

The Starting Planet.

This Planet contains Fire Bars and a 1-Up Mushroom. When the player advances on the platforms, they will go into a loop. This planet also has a Thwomp and a flamethrower, and a platform that takes Mario to the Gravity Planet.

Gravity Planet[edit]

The Gravity Planet.

Here, Mario must be careful as to not fall off the platforms and into a black hole, because the gravity changes back and forth here due to the gravity fields. There are also more Fire Bars and a Thwomp here. At the end of this area is a platform leading to the stairs.


Mario climbing the stairs to a fight with Bowser in Bowser's Star Reactor.
Mario climbing the Stairway to reach Bowser.

In this area, there are stairs that lead to the platform where Mario fights Bowser. There are yet more Fire Bars, flamethrowers, and Thwomps that make getting to the top harder. After the Fire Bars, Bowser will appear and then he will try to throw fireballs at Mario. When the player reaches Bowser, they will be taken to the Magma Planet.

Star Reactor[edit]

The Star Reactor.

This is the planet where Mario battles Bowser. When Bowser Ground Pounds the blue glass, lava will be exposed and burn his tail. The green plates can be used to block the shock waves Bowser makes. When Bowser is defeated, Mario will receive a Grand Star, unlocking the Kitchen.



This galaxy consists of only the following mission.

Level Image Summary
The Fiery Stronghold SMG Bowser Star Reactor Meteors.png This mission's objective is to defeat Bowser.


Names in other languages[edit]

Language Name Meaning
Japanese クッパスタープラント
Kuppa Sutā Puranto
Bowser's Star Plant
Chinese 酷霸王星工厂
Kùbàwáng xīng gōngchǎng
Bowser Star Factory
French (NOA) Usine Stellaire Stellar Factory
French (NOE) Usine stellaire Stellar Factory
German Bowsers Sternenfabrik Bowser's Star Factory
Italian Sistema Stellare di Bowser Bowser's Star System
Korean 쿠파 스타 플랜트
Kupa Seuta Peullaenteu
Bowser Star Plant
Spanish (NOA) Dimensión Estelar de Bowser Bowser's Stellar Dimension
Spanish (NOE) Dimensión Estelar Bowser Bowser Stellar Dimension