Mikey learns that the Code Crown enables the "owner" to rule a specific zone in the Digital World, and gathering all 108 Code Crowns is the key to becoming the King of the Digital World. Mikey and friends transfer to the Island Zone, an island which floats unmoored in the sea. They ask locals Archelomon and ChibiTortomon where the Code Crown is, so they can protect the zone from the Bagra forces. They learn the Code Crown is in a place that can only be reached during the Summer Festival. Meanwhile, Neptunemon of the Bagra Empire bombards the island from his Mantaraymon fleet. Seeing that they're outnumbered, Mikey and friends secretly leave the island and hijack the fleet, crushing the other Bagra Digimon with it. The evil Octomon attacks the hijacked fleet, forcing Mikey and friends into the water. ChibiTortomon comes to help them, and Mikey uses Digi-Fusion to combine ShoutmonX2 and ChibiTortomon. Now, capable of maneuvering under water, ShoutmonX2+ repels Octomon. While MIkey's team celebrates its victory on the island, Neptunemon forces a captive Archelomon to tell him the location of the Code Crown.