Defeating Mordred and his warrior suit wins the island, and you receive the Island Medallion and 50 Poptropica credits.
Nothing. When you defeat the giant robot, you take the Orb back to Arturus and Mordred is left behind in his castle. You receive the island medallion.
You go through the puzzle door and beat Mordred. (see two related questions)
(See the related questions for each of the three planets, and for the final battle on Mordred's asteroid.)
all you get is the island medallion and 100 credits
You can't. If you leave without finishing the game, it stays completed. Once you beat the game, there is no way to come back through the portal to it.
Presumably he is still stuck in his castle in the far galaxy, and no longer has the Orb or the Golden Key to open the portal again. If you return to the asteroid, it is just a dead end.
On Astro Knights Island, there are four "boss" robots, one for each planet and the final battle. This arrangement is similar to that of other video and computer games. You must beat all three planets to reach the final battle, because you need the three space knights to get the Golden Key that leads to Mordred's lair. (see the related questions for solutions)
The 9th Island was Astro Knights island released in 2009. (see the related question)
well just beat the stupid thing ingnore her baby birdies
Just beat Mordred and she'll be free
Wimpy Wonderland Red Dragon Island Counterfeit Island Mythology Island Astro Knights Skullduggery
well just beat the stupid thing ingnore her baby birdies