After having to constantly save Princess Peach from Bowser, Mario just wanted a nice vacation. Luckily the Princess of the Mushroom Kingdom is good at other things than just being kidnapped or baking a cake. After the Mushroom and Equestria signed a Peace Treaty, Princess Celestia has invited Mario and his friends for a first time visit. Excited and overjoyed, Mario decides to invite his long time rival Kirby along. But of course Bowser wasn't done. While plotting his revenge against Mario, he runs into King Dedede of Dreamland who explains a certain organization that sells monsters that can easily overpower Mario and Kirby. Bowser jumping to the conclusion joins forces with Dedede and follows Mario to Equestria where they build an underground hideout so they can secretly order monsters from Nightmare Enterprises. Unfortunately when a runaway monster suddenly shows up, Equestria is once again thrown into chaos. The elements have been stolen and now only Mario and Kirby can save the day. With Twilight and her friends accompanying the them, the two must now face their biggest challenge yet.

Mario and Kirby belongs to Nintendo
MLP FIM belongs to Hasbro studios.
Characters from the games and the Kirby Right Back At Ya T.V. series will be making an appearance