Bowser

Bowser
Bowser appeared, and was again the final boss in New Super Mario Bros. Wii. Here, he appeared together with his eight children, the Koopalings and Bowser Jr. In the last castle of World 8, Bowser was found in the last chamber, sending out fireballs toward Mario, similarly to his appearance in the original Super Mario Bros. When Mario began the battle, Bowser was fought in the same manner as in Super Mario Bros., as well as in the first castle in the original New Super Mario Bros. After Mario pressed the switch that caused the bridge to collapse beneath Bowser, sending him falling into a pit once again, a victory fanfare played and Mario rejoiced, believing to have won. However, upon inspecting Princess Peach up above, it turned out that it was, in fact, Kamek, disguised as Peach. Kamek then casted a spell over the chasm that Bowser had fallen down. As a rumbling noise began, Kamek paused to see if the spell had actually worked. To his surprise, Bowser appeared, now at a gigantic size, knocking Kamek off his broom, and proceeded to chase after Mario. Mario rushed through the area beyond the boss room, luring Bowser into launching fireballs at walls so that they were destroyed and he could proceed. After a long and grueling chase, Mario heard Peach's voice, and saw her in a cage up ahead, over a large switch. Jumping on the switch, Mario opened a humongous chasm, right underneath Bowser, that drained the lava from the room and took the Koopa King with it, defeating him for good. He was later seen being helped by his children, having survived the drop and returned to his normal size, but then crushed by his own Castle.