From the review, "Mario & Luigi: Dream Team‘s story is pretty standard fare. The brothers, along with many residents of the mushroom kingdom, voluntarily take a trip to a place called Pi’llo Island after they receive a direct invitation. While there, they find themselves in the middle of re-emerging battle between the Pi’llo folk and and a bat king named Atasma. At some point in the past, the Pi’llo fought to imprison Atasma in a place called the Dreamworld. However, as a final act of evilness, Atasma shattered an artifact known as the Dark Stone moments before he was imprisoned. The shards of the Darkstone effectively turned the Pi’llo into stone pillows. Once Mario and Luigi learn of the situation and Atasma’s escape, they have no choice but to stop him (and Bowser that shows up out of nowhere) from taking over the real world. All things considered, it’s a pretty basic plot."