Making a welcome return to the schedules is a re-run of this classic show. It's on Channel Four at 7.10am!. Four aliens have been sent to earth to appear in human form in order to study the peculiarities of human race. It's funny, original, slickly acted, especially by John Lithgow. No canned laughter, it's performed in front of a live audience. Sometimes not quite PC; it probably would not be made today. Proof that at least once the Americans were able to produce original comedy.