Science Fiction movie : Need help

in General Discussion edited January 2014
A long time ago in a galaxy far far away, I remember seeing a science fiction- suspense thriller about a group of scientists doing research on a variety of monkeys, & other some isolated arctic / antarctic base.

Anyway, one by one, these scientists meet with apparent accidents, but as the death toll increases, they begin to suspect that one of their number is a murderer.

Little do they realise that they are being selectively bumped off by one of the Monkeys/ apes..I think his name was Caesar or some such notable..

I saw it back in the early 70's & on a Black & White TV.

I definitely remember the plot..but can't for the life of me, remember its name..

And I know its not " The Thing "

No spaceships from outer space involved...

So, does anyone know..?


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