you should go to an island, not a planet, and it should be the first one ever, early poptropica!
It doesn't matter what order you go to the planets in, but you have to beat the enemy on each planet to get the knights to follow you.
you get in a space ship and go to a planet.
fire planet
all you have to do is go on the space ship you made in pewter moon and move to the cordinates 15 15
Answer: You can get to the fire planet but to do so is to go and keep jumping on the stones.
You go to the earth like planet and click on it
go in the openings
You jump into the volcano and go in.
If you didnt already beat fire planet beat that. Or find the crystal rock thing.
Planet 15.15 is the jungle planet
Go to the lower left, towards the asteroid belt, and look for an extra planet.
each knight is on a different planet in space. First you need to defeat a boss on each planet. then you get a knight.