Mario and Luigi were going for a walk in the Mushroom Kingdom. But then Bowser's airship attacked, dropping down Koopa Troopas and Bullet Bills and making chaos to the kingdom. Mario and Luigi jumped under seprate ? Blocks, two leaves came out as the brothers caught them and transformed to Raccoon Mario and Fox Luigi. They flew with their tails as the brothers caught up to Bowser's Airship and heard "MARIO! LUIGI! HELP!" in Princess Peach's voice. "Mama Mia..." said Luigi as the green plumber and his brother was about to land on the airship, but Bowser Jr. appeared in his Koopa Clown Car and attacked the Bros. by breathing out a fireball. Getting hit by the fire, Mario and Luigi last their power-ups as they were waving their arms and legs and automatically fell down from the sky! Mario's legs was stuck in the ground while Luigi's head was in the ground as well. The Bros. escaped from the ground. While Luigi was spitting out dirt and tying to swipe it off his tounge, Mario was looking around all the smoke and damaged toad houses as he heard a call. It was the Toad Brigade! Mario called Luigi and the Bros. went off to see the Toad Brigade. Interestingly, a Bob-omb and a Lakitu follows the Bros. to join their adventure.
|Mario||The red plumber is back and with the help of his brother and 2 helpful "villians" to save the Mushroom Kingdom and Princess Peach!||Mario is an all-around type. He has the right amount of speed, right amount of jumping height, and right amount of skill.|
|Luigi||Luigi, the faithful brother, wants to help Mario again. Luigi can also be playable in single player mode.||Luigi is a little more different than Mario. Luigi has the same amount of speed as Mario, Luigi can jump higher than all the rest of the players, and Luigi slips for a second when he stops.|
|Bob-omb||Unlike the rest of the Mario games, Bob-ombs no longer appear as enemies and you can play as Bob-omb. This Bob-omb betrayed Bowser, and wants to destroy Bowser to make him feel how the Bob-ombs feels to the king. Bob-omb can also be playable in Single Player.||Bob-omb has low jumps, fast speed, and automatically stops when he ceases.|
|Lakitu||Lakitu also appears as a playable character and the do not appear as enemies. Lakitu has the same problem as Bob-omb and wants to kick some Koopa! Lakitu can also be playable on Player 1.||He has the same skills as Mario. Lakitu appears to float near the ground with his cloud instead of walking. He can also hover for about 13 seconds, just like Princess Peach in Super Mario Bros. 2.|
|Wario||Wario appears as a secret character. You do not unlock him but need to put in a code. Hold the B button for 10 seconds on the Character Selection screen and you should hear a coin sound. Selecting one player mode will not go to the character selection. Instead, you hear Wario saying "Wario's number 1!" and starts the game. The cutscene has been skipped and when you're on the World 1 map, you see Wario. Then you can playas Wario in any level you like!||
Wario has medium height jumps, does not run as fast as the other characters, and his skills are perfect. Wario can collect power-ups just like the other players.
He cannot die (like Nabbit in NSLU) such as when he gets crushed by a Thwomp he gets flattened for a few seconds, but he can die in bottomless pits and lava.
|Peach||Once again, Princess Peach has been captured by the King of the Koopas. The princess is now wondering if she should upgrade the Toads and Yoshies to defend the Mushroom Kingdom.|
|Toad Brigade||The Toad Brigade help the Bros. to save the princess. On the Toad Brigade's new Mushroom Ship (your main hub-world), you can get new upgrades by trading in coins you collected from previous levels.|
|Yoshi||Yoshi is a ridable character just like the earlier 2D Mario games. You can obtain them in Yoshi Eggs on some levels. Just like SMW, you can bring Yoshi to any level you like. Only green Yoshies return from NSMBU.|
|Baby Yoshi||Baby Yoshies return from NSMBU. Magenta, Blue, and Yellow return. But Green Baby Yoshies are new. The can extend their tongues to eat more enemies. Baby Yoshies are more common than fully-grown Yoshies.|
|Nabbit||Nabbit appears as a replacement to Toad Houses. Nabbit opens a shop to give the player free items. He only appears once in each world.|
|World Map||Name||Main Enemy||Fortress and Castle Boss|
There is an upcoming project making the 2nd installment of the series is code named Super Mario Wii Adventure 2.