The movie begins with Mario talking on the phone with Sonic (just for a little reference).
We have a short sequence where we see Toadette pleading with her father, Captain Toad, to let her go on an adventure. Suddenly, the Kingdom is attacked by Donkey Kong, who seeks revenge for something Mario's father did to him. Mario and Luigi, with the help of yoshi and captain toad fight against DK and he tells them everything his father did to him and how he stole the love of his life.DK flees, but warns that he will return. Mario and Luigi go on an adventure and decide to investigate the macaque. Along the way, Luigi finds a letter that tells him that he has won a mansion in a raffle, Mario tells him that he should not trust but Luigi leaves. Next, Mario is attacked, he can't alone and when it seems that everything is finished, Toadette appears riding Yoshi and they save Mario. Once they arrive, they fight against DK and make him understand that Mario is not like his father and that he would never do that to anyone. DK becomes a potential ally. After a very great sermon, Captain Toad gives his consent to go on an adventure with him, on the condition that he was trained by Mario. The post-credit scene is similar to Kirby's.
