The Nightmare Worlds of H.G. Wells - Season 1 Episode 3

Entymologist Paul Hapley delights in discrediting the findings of his rival Professor Pawkins and when Pawkins dies, after Hapley has rubbished his paper on the Death's Head moth, Hapley finds that, with no adversary, his work has deteriorated. Then he discovers a unique moth, which only he can see, but it has Pawkins' face and Hapley fears that his old rival has returned from the dead to punish him – and he is right.