Mad Monster Party

Mad Monster Party (the onscreen title includes a question mark, i.e. Mad Monster Party?) is a 1967 American animated comedy film released by Embassy Pictures for Rankin/Bass Productions, Inc.
Baron von Frankenstein (Boris Karloff) decides to retire, leaving the monster business to his nerdy nephew, Felix Flankin (Allen Swift). Frankenstein plans to announce his decision at a convention of monsters that includes his creature and the creature's more intelligent mate (Phyllis Diller), Frankenstein's seductive laboratory assistant Francesca (Gale Garnett), and playing the part of femme fatale), Count Dracula, the Werewolf, the Creature from the Black Lagoon, The Invisible Man, The Hunchback of Notre Dame, Dr Jekyll & Mr Hyde, the Mummy, It (a knock-off of King Kong), and many more. However when Felix proves to be an incompetent (and unsuitably kind-hearted) human, the monsters plot to eliminate him and gain control of Frankenstein's latest discovery: the secret of total destruction!
Cast

Boris Karloff as Baron Boris von Frankenstein
Allen Swift (name in the credits is misspelled as Alan Swift) as Yetch/Dracula/Felix Flankin/Invisible Man/Dr. Jekyll/Mr. Hyde/Chef Mafia Machiavelli/Mr. Kronkite
Gale Garnett as Francesca
Phyllis Diller as the Monster's Mate
Ethel Ennis sings the opening song/score
Directed by Jules Bass
Produced by Joseph E. Levine
Arthur Rankin, Jr.
Larry Roemer
Written by Len Korobkin
Harvey Kurtzman
Arthur Rankin, Jr.
Starring Boris Karloff
Allen Swift
Gale Garnett
Phyllis Diller
Ethel Ennis
Music by Maury Laws
Cinematography Tadahito Mochinaga
Studio Rankin/Bass
Distributed by Embassy Pictures (later StudioCanal)
Release date(s)

March 8, 1967

Running time 95 minutes
Country United States
Language English,