In early development stages of Fallout, the developers threw around dozens of ideas for the game. One of the joke ones included Irvine as a location. It was known as Utopia and was run by the mysterious Irvine Land Corporation. It was surrounded by massive walls and patrolled by killer robots. It included tall glass buildings, palm trees, no crime, no poverty – like an ideal pre-War society. However, the corporation controlled every level of society in Irvine, enforcing its pristine perception with an iron fist. The robots, controlled by a super computer in the middle of the city, which was manufactured by the Irvine Land Corporation, were ostensibly the "helpers" that take care of the population's needs, but were in reality their overlords, controlling every aspect of their lives. Outside the walls of Utopia, the ruins of a pre-War company called Interplay could be found. To access the area, the player would have to shut down lasers defending it, using a pass card of a specific Interplay employee. If disabled, this would allow an NPC in the ending slide to steal Brian Fargo's car (a subject of much amusement to employees at the time). It was never taken seriously as an option.
On the map of Fallout, Irvine (which is east of The Cathedral) and the surrounding area is a comically giant crater.