This would have been a children's film or TV prog, and I probably saw it in the mid 1980s.
It was filmed with puppets (stop motion or marionation, I don't remember), and was about a gathering of classic movie monsters (Dracula, Frankenstein's monster) at the lab or home of some respected member of their group. I think he was an old man who was dying or retiring, and the gathering was about naming a successor.
I remember a couple of moments fairly clearly:
Dracula - possibly aboard a ship? - looking at the old man's castle in the distance, then saying in a very stereotypical 'vampire' accent, "Now you vill see ze original batman!", then turning into a bat and flying to the castle.
The old man's assistant/daughter scheming behind his back and telling at least one of the other monsters that they were not going to be chosen as successor.
The assistant/daughter, probably at the end, tearfully confessing to her love interest that she can't love him because she's a robot, saying something along the lines of "My heart is just a pump that circulates coolant".
That's about as far as I can go. Does it ring any bells for anyone?