The Island of Dr Moreau (1977)

This is a pretty good rendition of the famous H.G. Wells story. Burt Lancaster plays the mad scientist who oversees an island where he experiments on animals trying to make them human-like; Michael York is the unfortunate man who finds himself stranded on said island. Both of them are well-cast in their roles and are well matched in their battle of wills, but what is particularly fascinating in the film is the believable depictions of the human-animal hybrids.