Not science fictional, Lucasfilm Games/Lucasarts’ The Secret of Monkey Island is a fantasy game that takes place in the Caribbean during the 17th century. It follows a young man who wishes to be a pirate and claim a fortune. Postmodern anachronisms, puns, and tongue-in-cheek game advertisements for other Lucasarts games makes this an interesting and enjoyable game to play from the early 1990s.
The original Maniac Mansion was good, but the sequel Day of the Tentacle is comedic science fiction gold! In the longplay embedded above, you can follow the story as Bernard, Hoagie, and Laverne fight the ubermensch Purple Tentacle. The early 1990s was the high water mark for Lucasart humor-laden adventure games. Sam and Max Hit the Road is another amazing game from that era (fuel for another post!).
One of my favorite games for PC is Star Wars: X-Wing by Lucasarts. Actually, the main force behind my wanting a PC at the time besides the fact that my Commodore Amiga died was knowing that a game like X-Wing was coming out. I had already spent months studying how PCs work and how to build one for myself that I settled on the components that I wanted, but I had one custom built by a local computer shop in Brunswick.
In the video above, MaliciDWildman takes us through the beginning of X-Wing, and he has a full series of the missions available in this playlist.