Assault of the Dreadnought

Assault of the Dreadnought is the final Gummi Mission available in Kingdom Hearts II. Upon completion the first time through, it re-opens Twilight Town for regular gameplay and to reach the final world in the game.

In Kingdom Hearts II Final Mix, the EX S mission requirements are:
 * Mission 1: Gummi ship must have at least two Ultima weapons.
 * Mission 2: Main Gummi ship must fit in a 3 x 3 box.
 * Mission 3: Gummi ship must have a Drain weapon.

Trivia

 * Assault of the Dreadnought seems to pay homage to the Star Wars universe, alongside the Twilight Town characters Biggs and Wedge, namely referencing the assault of the Death Star in Episodes IV and VI. The ship itself could be seen as a reference to the Star Wars assault ship named the "Dreadnought," which would often be a core ship leading a group of other starships to assault a planet, as the Organization seems to be doing to Twilight Town.
 * Assault of the Dreadnought most likely got its name from the massive airship used by The Emperor in Final Fantasy II, which has since then been reused in various Final Fantasy installments.