Whether you know the technical term or not, you are aware of the concept as a Star Trek fan: Bottle Shows. It's where the production team tries to save some money and has their intrepid crew stay put on the ship. They don't go to a new planet, they don't meet a new alien race (for the most part), and the special effects are minimal.
Some people consider these episodes boring but Char and Tristan think that with constraint comes creativity. Due to this outlook, they examine how you can get a more intimate character driven story without the pew pew.