The Boomsday Machine is a giant machine that appears in the video game Super Mario Galaxy 2, that was possible created by Bowser Jr.. It appears as a boss, that is driven by Bowser Jr. in the galaxy Bowser Jr.'s Boom Bunker. It has many attacks, which would be turning all electric and sucking all the clouds near it, running into Mario, or launching electric balls from a cannon. It is the only boss in the game that is fought by Mario using the Cloud Mario ability. Its weaknesses include getting on top of it and smashing it. After making the boss lose two lives, it will become much taller.