Discovery had a plot line which involved a giant tardigrade which enabled a star ship to jump massive distances in time and space. However, Anas Osama Ibrahim Abdin claimed that the idea was based on an unreleased video game he wrote which also dealt with tardigrades that survived the outer reaches of space.
Tardigrades are real life, tiny creatures that typically survive within water droplets. The most interesting aspect of tardigrades is that they have been shown to have been able to survive in the vacuum of outer space. Abdin's video game also dealt with tardigrades that survived the outer reaches of space. On essentially this basis alone, Abdin filed both his original suit and the appeal.
After the Second Circuit lower court had already dismissed the claims, the Court of Appeals agreed in upholding the lower court ruling that both the video game and the TV show were relying on uncopyrightable scientific facts about tardigrades and their ability to survive in outer space.
The case ruled that copyright can be afforded to specific expression, but not to a general idea. And certainly not to an idea comprised essentially of real life scientific discovery. So, if Discovery told the same story about the same tardigrade creature, merely having a tardigrade in its plot is not somehow infringement just because both works are set in space.