Megahammer is a boss in Super Mario Galaxy 2. It appears in Bowser Jr.'s Fearsome Fleet. It is a giant robot operated by Bowser Jr.. It attacks by launching Bullet Bills and Banzai Bills. It also has a shockwave attack. o defeat it, the player must use Yoshi to catch the oncoming Bills with his tongue. Yoshi must then spit them back at the robot's three, large, blue orbs. Two of the orbs are on Megahammer's chest while the last one is on his back. The player can use the Sling Star to get to his back faster than walking around Megahammer. Once all 3 orbs are destroyed, the protection on Bowser Jr's control is in the robot's head. When Megahammer slams down its mallets, the player must use a Bullet Bill to hit Bowser Jr.'s cockpit twice. Megahammer is fought again, with the Daredevil Comet's conditions. That means Mario has to defeat Megahammer with one wedge of health. Later in the game, Megahammer can be seen in Bowser Jr.'s Boom Bunker broken. The Toad Brigade can be found first in the galaxy, hiding behind an arm. Megahammer is still alive, as for Bullet Bills are still shooting out of it and its eyes are blinking black to red. It is unknown how Bowser Jr. destroyed Megahammer, but it could probably be the use of his Boomsday machine.