UFO: The Cat with Ten Lives (Episode 03)

SHADO pilot Jim Reagan is on leave and whilst driving down a country road with his wife at night, he sees a Siamese cat blocking his way. When he gets out to tend to the cat, he is rushed by aliens who abduct him and operate upon him. As a consequence, when he is returned to Earth he is totally under the influence of the cat and its commands - and the cat is at SHADO headquarters.