A Cold Night’s Death (1973)
This is an unusual made-for-TV movie: it’s more Strindberg than Spielberg. Robert Culp and Eli Wallach star in a virtual two-man show, as scientists stuck in a snowbound research station performing stress experiments on monkeys and chimpanzees. Soon it becomes apparent that someone — or some thing — is experimenting with them. Or is it all in their heads? And even if it is, will it make any difference to the outcome?