Though the Mysterons plan to conquer the Earth,
This indestructible man will show what he's worth...
Except that I don't recall the Mysterons ever expressing any intention of conquering the Earth - their goal always appeared to be revenge for human aggression after they were brutally attacked by the first Mars expedition without any provocation. So pain, death, etc. yes, but conquest no.
Am I right about this, or is there something I've forgotten?