If you fed the mechanical mouse to the mechanical owl (Merlin), he will retrieve the green fuel rod. Click on him, then on the rod.
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.
He says "bard".
You do not get or use a bucket on Astro Knights Island.
There is no treasure chest on Astro Knights Island.
When you enter the underground laboratory, go outside and feed the mouse to the robot owl. He will follow you and can retrieve items. When you enter the cell, the robot invader self-destructs and the vial (fuel rod) is thrown clear. Click Merlin and then click the vial, and he will fly through the bars and get it for you.
There are no bird eggs in astro knights island.
its on the island
How do you talk to the girl in the hay loft at astro knights island?
You get the replacement green FUEL ROD for the SAUCER Excalibur from the robot invader in the dungeon. (see related question)
On every island you have to be the one to save whatever needs saving. That includes the kingdom in Astro Knights Island.
The green fuel rod on the Excalibur is broken and needs replacing. There is a rod inside the robot invader in the dungeon. (see related question)
You can re-enter the dungeon through a tunnel from Mordred's underground laboratory (under the hay bales on the farm). Feed the mouse ot the robot owl, then push through the mud wall, go down the tunnel, and enter the cell. When the robot self-destructs, click the owl then the rod and Merlin will get it for you. (see related question)