One Eyed Monster (2008)

When a ferocious blizzard strands the cast and crew of an adult film shoot, the ragtag band of eccentric heroes must band together against a mysterious and deadly alien menace which has literally possessed the casts largest member — Ron Jeremy (naturally). After slaying Ron, his detached penis embarks on a spree of carnal carnage on a colossal scale. With the help of a half-crazed Vietnam vet (Russ Meyer legend Charles Napier), haunted by his own wartime experience with this alien fiend, the race is on to trap and destroy this penile predator before there are more victims of its vicious, utterly unique method of murder.