This sounds like the infamous Plan 9 from Outer Space.
The titular plan involves using pineal and pituitary stimulation to awaken the dead:
The Ruler : What Plan will you follow now?
Eros : Plan 9. It's been absolutely impossible to work through these earth creatures. Their soul is too controlled.
The Ruler: Plan 9?
The Ruler : Ah, yes. Plan 9 deals with the resurrection of the dead. Long distance electrodes shot into the pineal and pituitary glands of recent dead.
And the aliens responsible fly around in saucers that are clearly models:
In fact, the creation of the "Plan 9" saucers were even more prosaic than that. Instead of using pie plates, Woods' "special effects" team simply drove to their nearest hobby store (This was the late 1950s, when there used to be hobby stores) and purchased a half dozen "Flying Saucer" models made by Lindberg Line. They removed the rocket engines, spray-painted models -- including the clear plastic domes -- silver and -- voila! -- an alien invasion force!
The film has also frequently been considered the worst of all time, and is featured on Wikipedia's listing of films considered as such.