Villain(s)  Prehistoric animal

Actor(s):  Tommy Kirk, Shirley Bonne, Bill Thurman, Annabelle Weenick

Brief Description  The 1969 monster movie It’s Alive! is a low-budget, sci-fi horror TV film directed, written, and edited by Larry Buchanan for American International Pictures (AIP). Filmed on location inside Onyx Cave near Eureka Springs, Arkansas, the movie is widely considered a cult classic of "bad cinema", notorious for its slow pacing, low-cost production value, and an infamously unconvincing monster suit. The film is notable for starring former Disney child actor Tommy Kirk and is believed to be an uncredited, loose adaptation of the Richard Matheson short story "Being".

Plot:
Newlyweds Norman Sterns (Corveth Ousterhouse) and his wife Leela (Shirley Bonne) are driving through the rural Ozark Mountains when their car runs out of gas. They meet a paleontologist named Wayne Thomas (Tommy Kirk), who is in the area searching for fossils. He directs them toward a nearby isolated farm for assistance. At the farm, they meet Greely (Bill Thurman), an eccentric and unhinged hermit, and his captive housekeeper/companion, Bella Pittman (Annabelle Weenick). Greely feigns hospitality but quickly traps the couple inside a barred, subterranean cave network built directly underneath his property.

Greely captures Wayne as well. The three prisoners discover Greely's dark secret: he keeps a living, prehistoric "dinosaur" (referred to in production notes as a Mosasaurus) trapped in the deep spring waters of the cavern. Because the creature prefers fresh meat, Greely intends to use the stranded travelers as live human sacrifices to feed his pet. The captives spend the majority of the film bickering, panicking, and trying to engineer an escape from the cave prison before they become the monster's next meal. Ultimately, only one of the prisoners manages to successfully break free and survive.