The Fate of the Universe

The Fate of the Universe is the Final Mission in Super Mario Galaxy and is the only mission of the final galaxy Bowser's Galaxy Reactor.

Mario has to venture through this galaxy until he encounters Bowser. Mario starts on a small, rocky area resembling part of a castle wall. When Mario uses gravity spotlights, he will climb the walls and arrive at a tower being guarded by Dry Bones. At the top, a large Gravity Spotlight sends Mario across to the Lava Planet. He must cross this by utilizing cooled lava sections moving in the opposite direction to him and sinking platforms. A second large spotlight carries Mario to the Ice Planet at the end of the pathway. The surface of the Ice Planet and the Lava Planet both cause one piece of HP loss for Mario if he touches it. The Ice Planet's pathway is formed by Ice Blocks that shoot in from space, but these vanish after a few seconds. The third planet, reached by another spotlight, is made of quicksand, which is fatal if Mario touches it. The planet is traversed by narrow platforms which move across the planet against Mario and dip beneath the planets surface. There are also Firebars in the way. Another spotlight takes Mario into a Space Junkyard where platforms shoot in to form a path and shortly vanish, similar to the ice planet. However, gravity arrows and Firebars provide tough-to-navigate obstacles. At the end of the pathway, a gravity spotlight allows access to the Castle Tower, a hollow, cylindrical planet made entirely of lava, stone and metal. Bullet Bills, Thwomps, Banzai Bills, and the platforms of the area all create a treacherous terrain for Mario. At the end, a Launch Star will take Mario to Bowser's Final Stand.

Bowser Jr. appears on his airship at the bottom of the staircase leading to Bowser with Princess Peach on board. He taunts Mario, then flies behind Bowser and begins shooting down the staircase with meteors. Along the way is a 1-Up Mushroom and a Life Shroom, but grabbing them takes up valuable time. After Bowser explains his plan, the gravity of a nearby metallic planetoid attracts him and Mario. He transforms into a boulder with his head sticking out of the top. If his head is hit by a Thorny Flower or Mario's spin attack, he will fall out of the boulder, and must be hit again to take damage. When he is hit for a second time, he and Mario will fly to another planetoid. Here, Bowser shoots fireballs which can be blocked by Stretch Plants, and transforms into a ball made of two of his shells. He then rolls around the planet. Mario must Star Spin into sling plants to knock Bowser onto his back, and then use his Star Spin attack on him. After Mario does this twice, he and Bowser will fall towards a giant sun, one of the biggest planets in the game. It is hollow with holes and the two combatants will fall through one of these to land on the reactor at the center.

Here, Mario fights Bowser in a similar way to how he does in Bowser's Star Reactor and Bowser's Dark Matter Plant where they are located on a reactor planetoid that resembles a Mario Strikers Charged ball, except for the fact that Bowser has the attack he used on the second planetoid, which Mario can only avoid. After hitting Bowser twice, Bowser will fall out of the reactor's gravity field and into the Sun. A Grand Star will then be revealed from inside the reactor, which Mario must obtain. As Mario flies away with the Grand Star, Bowser Jr.'s airship plummets towards the Sun, but Mario rescues Princess Peach and flies her to the area where he first entered the Galaxy. It is then revealed that Bowser has survived his fall into the gigantic Sun, but is stranded on the second planetoid upon which he fought with Mario, on a rocky platform which was sinking into the planet. As its gravity and mass increase, the planet sucks in more and more rocks from around it, then collapses under its own weight, becoming a giant Black Hole. It begins to suck up everything around it including Mario, Peach, Bowser's Airship Fleet, Peach's Castle, and the Comet Observatory. It would appear that everything is lost until Mario's Luma pops out, waves its arm and zooms toward the Black Hole. It is soon joined by all of the other Lumas. The Lumas twist the Black Hole into oblivion, but they appear to be destroyed in the process.

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