For those looking to understand why "The Truth is Out There" became a generational mantra, Season 4 is the definitive evidence.

In the finale, the show dared to question its own foundation. Mulder appears to have found proof of an alien body in a glacier, only to be told by a government informant that it’s all an elaborate hoax—a lie to hide military secrets. The episode ends with Mulder slumped over in his apartment, ostensibly having taken his own life, while Scully lies to the FBI to protect him.