Justin Theroux is on board to write a draft of astronaut romantic comedy Space Invader, which is set up at Fox. According to The Hollywood Reporter, Will Arnett is attached to star as a man who goes into space after he suspects his astronaut girlfriend is cheating on him. Theroux could potentially direct as well. As EW’s Michael Ausiello reported earlier this week, Theroux is also set to join Parks and Recreation in a major role.