A group of teenagers vacationing in the tropics takes a boat out to a seemingly deserted island. They soon find, however, that the island is inhabited by a wealthy recluse (Graff) and his staff. While their host is initially hospitable, he quickly reveals his true purpose: to [[HuntingTheMostDangerousGame hunt down and kill each of his visitors]], as he has done with everyone unlucky enough to set foot on his island.

For tropes and specifics relating to the ''Series/MysteryScienceTheater3000'' version, please check the [[Recap/MysteryScienceTheater3000S06E07Bloodlust episode recap]].

!!This film contains the following tropes:
* ActionGirl: [[ZigZaggingTrope Zig-zagged]]; Betty can flip an attacker effortlessly so long as there's a [[NoOSHACompliance conveniently uncovered vat of acid]] for him to land in, but she spends just as much time acting the DamselInDistress.
* TheAlcoholic: Tony, the kids' boat pilot
* ChekhovsSkill: Betty's judo training.
* {{Gorn}}: The shot of Balleau impaled through his throat and wrists is quite shockingly graphic, especially for being shown on TV.
** Or it ''would'' be if the spikes coming out of Balleau lined up horizontally, [[SpecialEffectFailure as they did before he was impaled]].
** One of the mooks getting melted by acid was also pretty graphic and not seen much in films of the time.
* HoistByHisOwnPetard: Balleau is impaled on the display rack he had purposed for the heroes.
%%* HuntingTheMostDangerousGame: Well... duh.
%%* LonersAreFreaks: Balleau.
* MadeOfIron: Balleau's henchman survives being [[YouHaveOutlivedYourUsefulness abandoned in leech-infested quicksand]], and later shrugs off multiple point-blank gunshots when [[TheDogBitesBack killing Balleau]].
* NonActionGuy: Pete the Nerdy Nerd
* PublicDomainSoundtrack: The music for this film has been used in several others as well, perhaps most notable in ''Film/TheUnearthly'', another film [[Recap/MysteryScienceTheater3000S03E20TheUnearthly lampooned]] in ''Series/MysteryScienceTheater3000''.
* SmugSnake: Balleau.
* TogetherInDeath: Balleau's adultrous wife and her lover end up [[{{Pun}} Stuffed Into the Cave]] together.
* WaxMuseumMorgue
* YouHaveFailedMe: Happens to both Balleau's primary henchman and to Tony the boat pilot [[spoiler: who is paid by Balleau to bring him hunting victims]].