The Grave Digger is the final boss of Normal mode. It also appears as the first major boss in Hardcore mode. The Grave Digger has the energy immunity, making it only be slowed down by the Electroshocker and Warden instead of being completely stopped. As it is a boss enemy, it is also immune to being frozen by freezing towers and slowed down by the Toxic Gunner. It also has stun immunity, which does nothing.
Molten's girlfriend, teases molten alot. Also, MOLTEN is a GIRL.