Bowser Jr.'s Fearsome Fleet

"Don't you know when to quit?! I'm gonna enjoy taking you out from the cozy confines of my robot cockpit! So you want a Grand Star, do ya? Well, come on, tough guy! Let's see if you're any match for Megahammer!"

- Bowser Jr.

Bowser Jr.'s Fearsome Fleet is the last galaxy of World 3 from Super Mario Galaxy 2. Mario fights Megahammer, operated by Bowser Jr. here. Hammer Bros. can be found in the pre-boss area. Yoshi is also found in this galaxy and is essential to defeat Megahammer.

Planets
NOTE: Unless otherwise noted, all names are unofficial.

Starting Planet
There are a few Fizzlits in this metallic planet, and two Bullet Bill blasters in the walls. There are some yellow platforms that disappear after a set amount of time. At the end of the planet, there is a glass sphere the player must break by making Yoshi eat Bullet Bills and spit them back out towards them. There will be a yellow and white platform, which the player will ride through the Gunner Path.

Gunner Path
This path is filled with Undergrunt Gunners and Space Mines. At the end of the path, the player will need to defeat the Fizzlits and flip the switch to continue. The player will need to also use a Bullet Bill to break the glass sphere blocking the exit.

Bullet Bill Planet
There is a Hammer Bro on this planet, along with several Bill Blasters. The player will have to break the glass dome covering the lever so they can progress.

Airships
This path is much shorter than the Gunner Path. There are a few Space Mines scattered along the path. During the player's travels, two Airships will appear, one with a ? Block and the other with a Hammer Bro and a Comet Medal. The player will need to shatter the glass sphere at the end of the path to progress.

Megahammer Planet
This is the planet where the player battles Megahammer. It is shaped like a green and white ring with a few Sling Stars and some black and yellow segments that fall off after Megahammer smashes its hammers against the planet or shoots a Banzai Bill at it. There are also some Star Bits around the top of Megahammer. There is a huge black hole in the center of the planet; however, Megahammer is not affected by it.

Green Star 1
The player will redo the Bowser Jr.'s Mighty Megahammer mission. The first Green Star is located just behind the rightmost Undergrunt Gunner while riding the platform on the Gunner Planet. The player must use Yoshi to grab the Bullet Bill and destroy the Gunner to be able to safely grab the star.
 * Planet Visited

Green Star 2
The player will redo the Bowser Jr.'s Mighty Megahammer mission. The last Green Star is positioned on the Airships. The player must jump on to the second airship, the one with the Hammer Bro and the Comet Medal, and carefully maneuver on the front plank, and jump off it on to the Star.


 * Planet Visited

Prima Official Game Guide description

 * "Bowser Jr. holds the next Grand Star. The Koopa King's off spring has a mighty pirate fleet he unleashes to slow you down, but with Yoshi at your side, you'll survive the ships. The massive robot Bowser Jr. is powering with the Grand Star is the toughest challenge yet, so be sure to seek out a Life Mushroom so you meet Megahammer prepared for battle."

Trivia

 * In the Italian versions of Super Mario Galaxy and Super Mario Galaxy 2, Bowser Jr.'s Airship Armada and this galaxy share the same name.

Bowser Jr.s Angstarmada