Exotic, invasive plant species have established a foothold, and they are refusing to let go. Millions of state and federal dollars are spent each year trying to stop these alien invaders from conquering yet more of our precious native lands. Dr. Doug Phillips braves the kudzu, the privet, the alligator weed and more to examine the growing problem of invasive plant species, the threats they pose, and how – if – these Alien Invaders can be controlled.