Area Fifty-Something

Area Fifty-Something is the secret place where the monsters and the aliens are usually seen. It is run by General Monger. Originally built as a prison for monsters in order to keep then a secret. The facility's function changed during the first alien invasion.

Trivia

 * It was introduced in the film and first fully named in the pilot episode, Welcome to Area Fifty-Something.
 * It is confirmed by the book The Art of Monsters vs. Aliens that Area Fifty-Something is the same facility the monsters where held in before the arrival of Gallaxhar.
 * It is revealed by the episode When Nature Shrieks and by looking at General Monger's uniform that the simple way of spelling Area fifty-something is Area 5?.
 * To keep secrets, Monger distracts the visitors with a hot air balloon as revealed in The Friend Who Wasn't There.