8) Emperor Ing
Featured In: Metroid Prime 2: Echoes (2004)
Helping people can be one of the greatest joys in life. Helping one race exact justice by exterminating another race that attempted to destroy them years ago? Well count me in. That's just downright dandy.
After you've arrived on the planet you agree to help U-Mos (leader of the Luminoth) regain the Light of Aether and destroy the Ing Horde. By the end of the game, you've ready to recover the last bit of energy and put a stop to the darkness for good. Unfortunately, the leader of the Horde, the Emperor Ing, isn't so willing to cooperate.
What follow is an intense, three part battle that involves you taking down his original, stationary form, his cocoon stage, and last his final, spider-like form. This battle definitely puts all of the stuff you've learned throughout the game to the test, as you'll be utilizing a huge portion of your equipment and skills to help you. The final form is particularly fun, and requires you to discern what weapon it's currently weak to.
Once the fight is over, the Emperor collapses and you recover the last of the Light. This causes Dark Aether to destabilize and begin to collapse on itself, forcing you to make speedy escape. Or it would be, if somebody wasn't blocking your exit. But that's for another post...
What puts this fight on the list is that it sums up your entire experience for Prime 2 in one battle. Everything has led to that point, and it really feels good to give the Luminoth peace once again.
8) Draygon (Super Metroid)
Draygon is a fun fight, because to my memory it's the only boss in the metroid series that has two completely different ways to kill them (I'm sure I'm wrong on this, but don't take that from me). Anyway, you can shoot Draygon as she swoops down on you, just like you do in most boss fights, or you can let her grab you, and grab hold of one of the rooms electrical outlets with the grapple beam to drain her, and you, of health. I would only recommend doing this if you have a ton of health, but it is and easy way the kill her. Either way this is a fun and memorable fight.