The replacement "fuel rod" for the saucer Excalibur will come from the robot invader in the castle dungeon. (see related question)
The other possible answer
On the jungle planet (X-15 Y-15), you need the Laser Lance to defeat the Phoenix birds. It is in the first section of the planet, down among the metal flowers.
The hovercraft runs on manure.
You have to get the fuel rod
You go to items, and you drag the fuel rod into the place of the broken one. It should power up.
Actually, Merlin has little to do on Astro Knights Island. He recovers the fuel rod from the dungeon when the robot self-destructs. And he battles Mordred at the very end of the island.
you use it to power the UFO on Astro Knights
You can't fly like in Super Power Island. You need a fuel rod for the saucer, and then you can get a new spaceship on the moon.
The fuel rod powers the saucer Excalibur. The hovercraft runs on manure.
put the manure that i dude gives you in it.
you dont take it out it comes out vby it selg
Feed it the robot mouse. Merlin the owl will retrieve the fuel rod for you. Just click Merlin and then the rod.
The hovercraft (hover board) runs on manure. The crashed saucer has a different power source, a green fuel rod. (see related question)
you get the fuel rod and enter the coordinates then you go to astrozone and ask the alien to use a ship