Better yet, have you seen "Night of the Marionattes" and episode of an old UK anthology horror series called "Supernatural" from the 1977?
It's a story based on an academic seeking to find out the truth about the Shelley's visit to the Villa Diodati where Frankenstein was written, and discovering the ghastly truth, which involves the most mind bogglingly ghastly puppet show ever depicted in any media(and that includes "Meet the Feebles")