Stranger Planet focuses on a police officer in Los Angeles who discovers that extra-terrestrial beings are living on Earth, Deadline reports.
The cop ends up working with two aliens to solve intergalactic mysteries.
The project has been created by Matthew Miller, who has previously worked on shows such as Chuck, Human Target and Las Vegas.
Fox has handed Stranger Planet a put pilot commitment, meaning that the network will have to pay substantial fines if the pilot does not get aired.
The network has also started developing a police drama about two female cops working in tough Los Angeles neighbourhoods. The characters are also thought to be participants in a reality show.
The show has been created by Gina Prince-Bythewood. Her previous credits include Love & Basketball and The Secret Life of Bees.
The third project picked up by Fox is a comedy called El Jefe, which focuses on a 30-year-old who is forced to move out of his parents' house. He ends up living with the family of his cleaner as he has nowhere else to go.
El Jefe comes from Moses Port and David Guarascio, who have previously collaborated on Happy Endings, Just Shoot Me and Aliens In America.
Fox is also currently developing a comedy with Tyler Labine, a drama about employees at a cosmetics company, a show called Gorilla Time and a CIA drama from Josh Friedman.