Now the second boss in Metroid Fusion is really cool, but about 2-3 other bosses have the same boss battle, of course with just the reward of different abilities. You may have noticed the big red-scabbed eye on the door just before the second boss and the first boss. The eye is on EVERY boss door to give you extra health just before the battle. That eye is basically are "checkpoint", not to save but to warn you that a boss resides in that room. So enough about that eye, so the second boss is basically a bigger and less spiked ball like the one when you beat the first boss. Now, to beat this ball you must have your missiles ready and shoot them when a little opening on the ball appears, but it will start charging a beam to fire at you that you must dodge. Another thing is that when you shoot a missile in the opening it will automatically shoot at you so you must jump out of the way at the last second. You should do this maybe 5-7 missiles later it will blow-up and you can claim your reward, the charge beam!

That boss is like a Easter egg because when you enter and see it have the appearance of a Chozo statue, even when you shot it at the ball in the hand reveal a false item.