Still recuperating up at Casey's grandmother's farm, the turtles are feeling the sting of boredom. However, a scientist known as the "Monster Hunter" has come to the area searching for a legendary monster, rekindled by the sighting of a green monster lurking in the woods. So Casey, Mike and Don decide to have a little fun with the Monster Hunter. It all becomes a bit odd when the boys find some other large green creature besides themselves lurking about. Can they survive both monster and Monster Hunter?