Mario gazing upon the Mega D-Star.

The Mega D-Star is the end result of the combination of all D-Stars into one single life form. After Dowmentio defeated Mario, he took the Mega D-Star and tried to destroy the Mushroom Kingdom, but Mario got up and defeated Dowmentio, splitting him back into Dowser and Dimentio. Mario was so close to reaching it when Dimentio used the power of Dimension D to attack the heroes.

After the battle,Dimension D is destroyed with Dimentio after Mario uses the Mega D-Star in Dimentio's dimension.

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