PLAN 9 FROM OUTER SPACE (1959) could be called a prequel to NIGHT OF THE LIVING DEAD (1968)-in as a force from space has risen the dead. Plan 9 was a test run for Plan 10--NIGHT OF THE LIVING DEAD-which is why Romero's production company was named Image Ten! (I made that up )
Lugosi was a classiclly trained stage actor-as was Duane Jones.
plus it has Tor and Vampira.