"Space Quest I: The Sarien Encounter" is a classic graphic adventure game released in 1986 by Sierra On-Line. Players control the character Roger Wilco, a janitor who becomes an unlikely hero. The game is set in a humorous science fiction universe where players navigate through various locations, solve puzzles, and interact with quirky characters. The main objective is to thwart the evil Sariens, who have stolen a powerful spaceship. Players must gather items, avoid dangers, and make choices that affect the outcome of the story. The game is known for its witty dialogue and engaging gameplay, making it a beloved title in the adventure genre.