Space Quest: The Sarien Encounter (Sierra On-Line, 1986)
The first of another "Quest" series by Sierra On-Line, Space Quest shows a much different side of the company. While not as inately funny as Leisure Suit Larry or as "grandiose" as King's Quest I or King's Quest II, Space Quest certainly does capture the essence of science fiction, and does pretty well telling a fairly serious story injected with very silly characters. If you are looking for a unique change of pace, but want a science fiction game with a lighter tone, Space Quest is good for you.