DRACULA VS. FRANKENSTEIN (1971)
Starring Lon Chaney Jr. and J. Carrol Naish
Russ Tamblyn also stars in this classic bad movie from the director of "Brain of Blood." Zandor Vorkov plays Count Dracula, who convinces a wheel-chair bound descendent of the mad doctor to revive the Frankenstein monster. The puffy-faced make-up on this creation is actually somewhat cool.
Chaney shows up in footage from an unused gore film called "The Blood Seekers," playing a mad zombie. I saw this as a child on an afternoon TV movie show called "Dialing for Dollars," and even then was blown away by how bad this movie was. It's an absolute must-see and was recently re-released to video.