To power the saucer Excalibur, you need a replacement green fuel rod. There is one inside the robot invader in the dungeon.
(see related question)
you get the green stuff an dthen put it in
Go to the king and queen and they will tell you.
you have to go to the hole between the bales of hay and tell the owl thingy to get it by clicking the owl and clicking the green thingy
The leaky green stuff is a broken Fuel Rod that powers the saucer. You will need a new one. (see related question)
If you mean the dripping fuel in the fuel rod for Excalibur, it is actually green. If you're referring to the wind blast through the volcano on the Fire Planet, it is supposed to be hot air and cinders. (see the related question)
Just one : her note about how Mordred kept stuff under his bed. Once you have this note, you can look under the bed for his Missing Journal Page.
Google "Astro Knight Island Walkthrough" on the stuff that comes up, pick a youtube video. That was easiest for me.
You can't patch it up -- all the green stuff has leaked out. Get a replacement fuel rod from the robot invader in the castle dungeon. You will have to enter through Mordred's underground lab and have the robot owl to retrieve it. When you have it, click the old one and drag the new one into its place. (see related question)
moss
I guess you just dress up cool, and beat a few islands to buy cool stuff in the Poptropica store.To be literally "cool" on Astro Knights Island, avoid getting hit by the dragon. The heat meter is also a timer, so you need to finish quickly.(see related question)
the knights work in the castle were the help the Lord with his stuff
You don't saw it you feed the owl the mouse so he follows you. Then you go to Mordred's hideout and press through the wall after a few secs it will break. Go in the hole with the owl then the ailein will self destruct then you send Merlin (the owl) in between the bars and he'll get the fuel bar (the thing with the green stuff.)