Spacers rumble at the refuel station

Spacers is a one shot TTRPG adventure that encapsulates the feel of retro sci-fi nostalgia. Inspired by media like Alien, Guardians of the Galaxy, the Jetsons, Star Wars, Star Trek etc. Players arrive at a space diner truck stop in search of missing cargo. They meet some strange npcs, and ultimately fight an alien space monster or two. This combat should be difficult and possibly deadly. This is a one shot, what do we really have to lose? This adventure was designed for three 5th level characters, and can be run in 4hrs or less.