Source: Bedknobs and Broomsticks
Location: Jolly Olde England
Threat Assessment: 6. They are working for the good guys but since this is a spell anyone can cast it so that has to be taken into consideration. They are like zombies except smarter, harder, and shooting in the head does not work.
Limitation: They exist within a confine of a spell.
Here's an alternate trailer recut so it looks like a horror movie