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5 /5

"Once again, Bowser comes to Mushroom Kingdom to cause trouble! But this time, makes it to STAR VALLEY & steals the King Star that was holding the power stars together, thus letting them spread! Bowser then builds a base in space called STAR BASE. But, worse is still ahead! Bowser at the end intends to use the King Star's power to absorb all star power from the planet! To beat Bowser, Mario must reach STAR VALLEY & use its space-blast cannon that can blast him to BOWSER'S STAR BASE. To do that, Mario must collect 80 power stars to open the door that Bowser sealed in STAR VALLEY. STAR VALLEY has a HIDDEN entrance you have to find. Can Mario get the job done?".

The in game references back the plot up as, according to some toads in the first overworld, Bowser has stolen the King Star from the Star Valley and is planning to use its "unusual powers" to cause "catastrophic" problems. In addition, the King Star held the other power stars together, so now since it is stolen, the 97 stars have spread all over the area. Another toad located in the Star valley elaborates his plans by saying that he plans to "absorb all of the star power (apparently all planets have star power) from the planet". This will "overwhelm the planet causing a vicious reaction that will result in the destruction of the planet". Mario needs to collect the power stars in order to enter and reach the Star Valley. He must use a special "Space-blast cannon" (a normal bob-omb cannon) to shoot to the star in the sky where Bowser's base is located and defeat him.

Super Mario: The Power Star Journey is a ROM Hack made by Fares242. It contains 97 Stars and it was released on July 13, 2012.

Nothing is mentioned about the Princess AT ALL. So we can assume she is not involved, or Bowser has kidnapped her again.