|Mario & Luigi: Chaos Crew|
|Series||Mario & Luigi|
|Predecessor||Mario & Luigi: Paper Jam|
Note: the game does not use a chapter system; however, to keep it organized, there will be chapters here.
Every year, a star known as the Chaos Star flies past the Mushroom Kingdom. The Star is what causes many bad things that happen, so residents of the Kingdom gather near a shrine built to the star which protects them from the star's power. However, Bowser came and tampered with the shrine, allowing the Chaos Star to inflict its dangers. Luckily for the Kingdom, Mario and Luigi arrived to take on Bowser.
After a tutorial battle against Bowser, the Koopa retreats. The Mario Bros. are congratulated, but danger soon strikes as the Chaos Star is seen to explode in the air. Five Chaos Crystals fall and land in five different locations. Enemies seem to crawl out of the ground itself as the power of the crystals are shown. Meanwhile, Wario and Waluigi are counting their money when they spot a small creature known as a Chaostritt taking some of their coins. Wanting their coins back, the Wario Bros. are taken control of as they chase the Chaostritt.