Go back to your spaceship on the top of the castle!!
The damaged saucer Excalibur (in the mud swamp) will not make it very far. You will travel to the nearby moon and get another ship. The three planets to which other knights have traveled is on the Queen's coordinate list. (see related questions)
When you defeat all the planets in astro knights island you go to the coordinates X-12, Y-83 ten there should be a giant asteroid retrieve the key from that planet and a portal will appear go in the portal and you will see the "princess" but it's a trick it's really Mordred. HOPE THAT ANSWERS YOUR QUESTION
Find the mystical weapon and the space knight, and beat the boss monster of each planet. On the jungle planet, you need to find the Laser Lance. On the other two planets, the knights provide the weapons. (see related questions)
In the Poptropica solar system, there are three other planets : the jungle planet (X-15 Y-15), the ice planet (X-73, Y-83), and the fire planet (X-83 Y-20). You have to defeat these planets and join with the three knights that travelled to them.
The key on the big asteroid in Astro Knights Poptropica is located in the lower right corner of the asteroid near the entrance to the base. You need to use the bridge to reach it, but be careful of the falling debris.
ya just take them to the black hole around the other planet
Because kids were complaining that all the other islands were too easy, so Jeff (creator of poptropica) wanted to make a super hard island and make every other island after astro-knights hard as well. But kids were complaining that every island after Astro-Knights was hard! so they made a game guide for Astro-Knights
You still have to go to the other two planets (jungle and fire) and defeat their robots. When you have all three knights, go to the asteroid at X-11 Y-82 to face the Binary Bard.
You have to beat the other two planets (jungle and ice) before confronting the Binary Bard on his secret asteroid (X-11 Y-82). You will need all three space knights with you.
Sir Cador joins you in your spaceship and you fly to one of the other two planets you have to defeat, the ice planet and the fire planet.
He is not seen, and you cannot re-enter the portal to the other galaxy. Presumably he is trapped there, and only time will tell if he ever returns to menace Arturus.
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)