The Sun of Earnon is slowly dying. The planets grow cold. Food is no longer plentiful. Life will soon become impossible to sustain. The scientific community of Xenon devised a plan to convert one of Earnon's lifeless planets into a new Sun.
The effort was centered around the development of a device called the Star Generator. The Star Generator would be capable of igniting an otherwise useless planet into a raging ball of flame. An expedition set out aboard the starship Arcada to successfully complete development and testing of the Star Generator. The Arcada is now returning triumphantly to Xenon with the fully operational Star Generator.
You serve as a member of the crew of the Arcada as a janitor.
That's right, a janitor. And not a very good one.
—Opening Scroll from Space Quest I: The Sarien Encounter