Bowser Jr.'s Fiery Flotilla

Bowser Jr.'s Fiery Flotilla is a galaxy confirmed to make an appearance in Super Mario Galaxy 2. Not much is known about this galaxy so far, but Mario is seen fighting a new boss in the game, Gobblegut, in the galaxy. It is possible that Bowser Jr. summoned Gobblegut to defeat Mario, since Bowser Jr. owns the galaxy.