Silver Space Pirate

Silver Space Pirates (often referred to by fans as "Ninja Pirates") are first encountered in Super Metroid in Lower Norfair in the room before you fight Ridley. They throw their claws at Samus and flip around above her. In order for her to defeat them she must jump over them until they turn gold and attempt to kick her, to which she can fire missles, supers, or charged beams at them. Their defeat opens up the doors to the room where Ridley is located.