It wasn't long ago that the cinematic undead obeyed the first law of corpse locomotion: A zombie might bleed on you, bite you, or rip out your ribcage, but wouldn't beat you in the 40-yard dash. Along with the Dawn remake, this new breed of souped-up zombie has appeared in recent movies like 28 Days Later (2002), Resident Evil (2002), and House of the Dead (2003). Why, all of a sudden, are the walking dead in such a rush?