In this episode of "Dark Place," the Douglas and the gang are haunted by a suspiciously green color that seems to have gotten into their water supply. Shortly after drinking the water, the consumer turns into an ape-like creature. Douglas searches for the source of this reverse-evolution and finds himself in a bicycle race against a former scientist who has been purposely polluting the water supply so everyone will become a monkey like him. After an epic fight between Douglas and the ape-man, Douglas defeats him and returns to the hospital to mix up an antidote for the rest of the hospital staff.