Stargate Atlantis: Season 3, Episode 6

3 - 6: The Real World

Waking up in a psychiatric hospital outside of Washington D.C., Dr. Elizabeth Weir is shocked to discover that her entire experience in Atlantis over the last two years was solely a figment of her imagination. Through the help of her psychiatrist Dr. Fletcher, she learns that a car accident that killed her fiancé left her in a near catatonic state and suffering from delusional psychosis.