"The Horror of Party Beach (working title 'Invasion of the Zombies') is a 1964 horror film in the beach party genre, directed by B-movie maven Del Tenney, which Tenney himself describes as 'a take-off on beach parties and musicals.' Unlike the beach party movies filmed up to that time, this film was shot in black & white and on the Atlantic coast. Produced in Stamford, Connecticut, the beach scenes were filmed in an area of town called Shippan Point. The Horror of Party Beach was included as one of the choices in the 1978 book The Fifty Worst Films of All Time.
A small East Coast beach town experiences a wave of attacks from creatures derived from water plants and dead human tissue mutated from radioactive waste. The monsters coalesced into humanoid form by attaching themselves to skeletons in a shipwreck. They immediately proceed to hunt down and kill (mostly young) women, as is common in the horror films of this era. Despite the murders committed by the monsters, young women in large numbers conveniently keep returning to the area for activities like slumber parties. Trying to stop the monsters are scientist Dr. Gavin, his young-adult daughter Elaine, and her boyfriend (and Dr. Gavin's employee) Hank Green, with some unexpected assistance from housekeeper Eulabelle and metallic sodium.
The original theatrical release of the film paired it with another Del Tenney feature 'The Curse of the Living Corpse' in a studio-sanctioned double feature. The advertising for the double feature capitalized on a gimmick first utilized by director William Castle, in which some newspaper advertisements included a call-out that stated 'For your protection! We will not permit you to see these shockers unless you agree to release the theater of all responsibility for death by fright!' and theaters were encouraged by the distributor to have patrons sign a 'Fright Release' before they took their seats. The trailer for the double feature also included this claim.
Movie-mocking television series Mystery Science Theater 3000 featured The Horror of Party Beach in one of its season 8 episodes in 1997 and it was also featured in an episode of the nationally syndicated cult movie show 'Cinema Insomnia' hosted by Mr. Lobo. The punk band Sloppy Seconds song 'The Horror of Party Beach' from their 1989 album 'Destroyed' chronicles the plot of the movie."