A director is filming on location in a house where seven murders were committed. The caretaker warns them not to mess with things they do not understand (the murders were occult related), but the director wants to be as authentic as possible and has his cast re-enact rituals that took place in the house thus summoning a ghoul from the nearby cemetery to bump the whole film crew off one by one.
A nerdy high school super whiz experiments with a chemical which will transform his guinea pig "Mr. Mumps" from a gentle pet into a ravenous monster. In a fit of rage against his tormentors at the high school, Vernon Potts goes on a killing spree, eliminating all of those who ever picked on him - the Gym Coach, the School Jock, The Creepy Janitor & his hated teacher, Ms. Grindstaff.
In Italy during World War II, an American headquarters is evacuated when German forces break through the front lines. A demolition squad is sent back to the abandoned headquarters to destroy valuable records that were left behind before they fall into German hands.
While searching for oil in the deadly swamplands of the Florida Everglades, members of a geological expedition meet an insane doctor who is working on an experiment to create a creature that is part man and part alligator.
A misguided scientist enables an alien from Venus named Zontar to come to earth in order to "help solve man's problems". However, as soon as Zontar arrives on Earth, it quickly becomes obvious that the three-eyed, bat-winged, skeletal black creature has a hidden agenda.