He says "bard".
The robot invader only speaks binary. You can't get him out of the cell. You need something from him and you'll have to find another way in. (see related question)
on astro knights island
You can't costumize him in Astro Knights Island or Super Villain Island but you might search the common rooms for someone with his face.
after u go to all three planets u will find binary bard at the end
The Princess has been captured before the start of the quest on Astro Knights island, and is not seen until the final battle in the lair of the Binary Bard.
The Binary Bard is on the Giant Asteroid near coordinates X-8 Y-82. But you cannot reach him until all three planets have been defeated and you have all three space knights with you.
The captured robot invader is in the dungeon beneath the castle library. There is no way to get him out that way, but there's a tunnel to the back of his cell. It leads to Mordred's underground laboratory. (see related question)
You get the replacement green FUEL ROD for the SAUCER Excalibur from the robot invader in the dungeon. (see related question)
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.
You can't costumize him in Astro Knights Island or Super Villain Island but you might search the common rooms for someone with his face.
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)
Back in 2009, you could costumize as the Binary Bard. So you could copy it from somebody who did.