"With special participation by Boris Karloff (and) Basil Rathbone." At the time of this film's theatrical release in 1974, both of these actors had been dead since 1967 and 1969, respectively, and their "special participation" was actually limited to appearing in this film in clips from real films that they had each starred in with Vincent Price: Karloff in The Raven (1963) and Rathbone in Tales of Terror (1962).