Trog is a 1970 British science fiction horror film directed by Freddie Francis, and starring Joan Crawford in a story about the discovery of a troglodyte (or Ice Age "caveman") in twentieth-century United Kingdom. The screenplay was written by Peter Bryan, John Gilling, and Aben Kandel. Trog marks Crawford's last movie appearance.

Plot

Set in contemporary Britain, the film follows Dr. Brockton (Joan Crawford), a renowned anthropologist who learns that in the caves of the countryside a lone male troglodyte is alive and might be able to be helped and even domesticated. In the interest of science and the potential groundbreaking discovery of the missing link, she gets the creature to the surface; and while the rest of the townsfolk and police scatter in terror, Brockton stands steady with her tranquilizer gun and stuns the caveman into submission. She brings him back to her lab for study, but runs into trouble as a few people oppose the presence of a "monster" in the town, especially Sam Murdock (Michael Gough), a local businessman who is not only afraid of the negative commercial consequences but is also suspicious of a woman heading a research facility. In the meantime, the creature, given the name of "Trog", is taught by Brockton to play and share; and the capacity for language is induced by a number of surgeries and a mysterious hypnotic device that causes Trog to see or relive his distant past, including clashes between various animals.