I love XKCD...
I kill my Metroid. With an IIIIIIIIIIIIIIIIIIICCCCCCCCCCCCCCCCEEEEEEEEEEEEEEEEEE BEEEEEEEEEEEAAAAAAAAAAAAAMMMMMMMMMMMMM!
Afterward, I turn the Metroid into a vaccine to save the world from the X. However, I leave one X alive, capture it and seal it away for my own evil purposes. So yeah.