Complete fourth series of the US television comedy about a group of alien explorers who assume human shape in order to learn more about earth's civilisation. Landing in the town of Rutherford, Ohio, the group soon displays a charming innocence in their reaction to human society. In this series, Mary (Jane Curtin) becomes dean of the university, the approach of the New Year makes Dick (John Lithgow) feel that he hasn't accomplished anything, and the Big Giant Head decides that Dick and Sally (Kristen Johnston) should swap bodies. Episodes are: 'Doctor Solomon's Traveling Alien Show'; 'Power Mad Dick'; 'Feelin' Albright'; 'Collect Call For Dick'; 'What's Love Got to Do, Got to Do With Dick?'; 'I Am Dick Pentameter'; 'D3: Judgement Day'; 'Indecent Dick'; 'Happy New Dick!'; 'Two-Faced Dick'; 'Dick Solomon of the Indiana Solomons'; 'Dick and Taxes'; 'Sally Forth'; 'Paranoid Dick'; 'The House That Dick Built'; 'Superstitious Dick'; 'Y2Dick'; 'Dick the Mouth Solomon'; 'Citizen Solomon'; 'Alien Hunter'; 'Dick vs. Strudwick'; 'Near Dick Experience'; 'Dick's Big Giant Headache (1)' and 'Dick's Big Giant Headache (2)'.