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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 click on the robot owl that follows you around and then click on the fuel rod then you get it!!!!!!!!!!!!!!!!! -Belinda-
Go outside and feed him the robot mouse, and he will follow you into the dungeon. Click the owl and then the fuel rod and he will retrieve it for you.
Merlin the robot owl will follow you in the underground lab once you feed him the robot mouse (ouch). He can retrieve the fuel rod from the dungeon after the robot explodes. Just click on Merlin and then the fuel rod.
Feed the robot mouse to the owl, and then he will follow you. In the dungeon cell, click the owl, then the fuel rod, and he will retrieve it for you. (see related question)
Go to Mordred's tunnel and you'll see the robot. Get the fuel rod and then go to the ship. From then on, you'll be in SPACE!
You need Merlin the robot owl to retrieve the green fuel rod. Go out of the laboratory and feed him the mouse from the Maid's room. Now he will follow you. Click on Merlin and then the fuel rod and he will get it for you.
Merlin the mechanical owl will recover the fuel cell for you. Feed him a robot mouse and he will retrieve the dropped fuel cell : point to him, then to it.
The UFO has a broken fuel rod. Go to the dungeon and click on the robot. It will explode, leaving a new fuel rod. Click on Merlin and he will fetch the fuel rod for you.
Feed it the robot mouse. Merlin the owl will retrieve the fuel rod for you. Just click Merlin and then the rod.
The crashed saucer Excalibur needs a replacement for the broken green Fuel Rod. You can get one from the robot invader in the dungeon. (see related questions)
When you feed the robot mouse to Merlin the owl, he follows you. If you click on him, then a location, he will go there. This is useful when the fuel rod is out of your reach in the dungeon.