Actor-turned-writer Justin Theroux is set to pen a draft of Space Invader, an astronaut romantic comedy at Fox.

According to The Hollywood Reporter, Mike Lisbe and Nate Reger sold the project and penned the original draft of the comedy, which centers on a man who decides to go to space after he suspects that his longtime girlfriend, an astronaut, is cheating on him with another spacewalker. Will Arnett is attached to star.

Theroux could potentially direct the title as well.

No production date has been set.