Bullet Cell

A boom launches you out of the sweet, slimy embrace of your previous home... It's cold now and you'll give anything to go back... But what's this?! Something... someone else is sucking you in! It can't be... Yes! YES! IT IS!! 

Congratulations! You've successfully infiltrated a new host! But your job isn't done yet. Make your way through various parts of the body, taking down cells that block your path and taking over cells that you think will make your trek easier.