Ghost in the Invisible Bikini (according to the film and all advertising material) is the seventh (and last) of the American International Pictures (AIP) beach party films and was released in 1966. The entire film takes place in and around a haunted house with no beach in sight, with the teenage gang instead cavorting in and around it and the adjacent swimming pool.
Besides the usual bikini-clad cast, random singing, silly plot line, musical guests, and ridiculous chases and fight scenes, the continuity linking this to the other beach films is the Rat Pack motorcycle gang led by Eric Von Zipper (Harvey Lembeck), as well as the appearance of previous beach party alumni Tommy Kirk, Deborah Walley, Bobbi Shaw, Jesse White, Aron Kincaid, Quinn O'Hara and Boris Karloff.
Pop singer Nancy Sinatra, who was on the rise at the time just before the film was released, has a supporting role and performs one song written for the film; and The Bobby Fuller Four appear as themselves and sing two songs. Claudia Martin, daughter of Dean Martin, co-stars in the film as Lulu. The briefly famous Italian starlet Piccola Pupa appears as herself and sings a song.
The ghost of recently dead Mr. Hiram Stokeley (Boris Karloff) finds that he has 24 hours to perform one good deed to get into Heaven. He enlists the help of his long-dead girlfriend, Cecily, to stop his lawyer, Reginald Ripper (Basil Rathbone), and a henchman from claiming the estate for themselves. The real heirs, Chuck, Lili, Hiram's cousin Myrtle, and her son bring their beach party friends to the mansion for a pool party while Reginald Ripper also employs his daughter Sinistra, and J. Sinister Hulk's slow-witted associates Chicken Feather and Yolanda to help them terrorize the teens, while dopey biker Eric Von Zipper and his Malibu Rat Pack bikers also get involved in pursuing Yolanda for a share of the Stokely estate.
The film was released in April 1966.
The Los Angeles Times said the film "had little to distinguish itself from its predecessors beyond the rumour that this beach party romp ... will be the last in AIP's long proliferating series ... Old timers give the picture some class."
The film's theatrical releases was a commercial disappointment. Vincent Canby in the New York Times described it as "a flop". As a result, AIP made no further Beach Party films.
Philip Bent, who had a small role, died in a plane crash in July of 1966 shortly after the film's release. The same month Bobby Fuller also died.
Under its 'Midnite Movie' line, Ghost in the Invisible Bikini was released on Region 1 DVD February 15, 2005 by MGM Home Entertainment. Ghost of Dragstrip Hollow was on Side Two of the disc, emulating AIP's theatrical release double features of the 1960s.