Search "Metroid Fusion SA-X". It's a scary unbeatable enemy that you meet throughout the game several times that scares the <img src="smileys/smiley35.gif" border="0"> out of you each time it pops up that is extremely powerful. But it must notice you first, so when SA-X appears, you have to be quiet and not get into its line of sight. I made an enemy like that in my game, it's the first enemy in the game