Two FBI agents, Fox Mulder the believer and Dana Scully the skeptic, investigate the strange and unexplained while hidden forces work to impede their efforts.

Scully: It seems to me that the best relationships, the ones that last, are frequently the ones that are rooted in friendship. You know, one day you look at the person and you see something more than you did the night before. Like a switch has been flicked somewhere. And the person who was just a friend is suddenly the only person you can ever imagine yourself with.
Mulder: You know, they say when you talk to God it's prayer, but when God talks to you, it's schizophrenia.
Mulder: Sorry, nobody down here but the FBI's most unwanted.
Scully: Agent Mulder? I'm Dana Scully. I've been assigned to work with you.
Mulder: Oh, isn't it nice to be suddenly so highly regarded. So, who did you tick off to get stuck with this detail, Scully?
Scully: Actually, I'm looking forward to working with you. I've heard a lot about you.
Mulder: Oh, really? I was under the impression that you were sent to spy on me.
Mulder: Scully, I was like you once. I didn't know who to trust. Then I... I chose another path... another life, another fate, where I found my sister. The end of my world was unrecognizable and upside down. There was one thing that remained the same. You were my friend, and you told me the truth. Even when the world was falling apart, you were my constant. My touchstone.
Scully: And you are mine.
Scully: You have seen this before, I can tell. You lied to them.
Mulder: I would never lie. I willfully participated in a campaign of misinformation.
[entering Mulder's apartment]
Melissa Scully: Why is it so dark in here?
Mulder: The lights aren't on.
Deep Throat: Trust no one.
Mulder: I have a theory. Do you want to hear it?
Scully: Van Blundht somehow physically transformed into his captor and walked out the door, leaving no one the wiser?
Mulder: Scully, should we be picking out china patterns or what?
Scully: Mulder, toads just fell from the sky!
Mulder: I guess their parachutes didn't open.
Mulder: You have to be willing to see.
Scully: I wish it were that simple.
Mulder: Scully, you have to believe me. Nobody else on this whole damn planet does or ever will. You're my one in five billion.
Mulder: I've often felt that dreams are answers to questions we haven't yet figured out how to ask.
Scully: Sure, fine, whatever.
Deep Throat: And a lie, Mr. Mulder, is most convincingly hidden between two truths.
Cigarette Smoking Man: What is this?
Skinner: This is where you pucker up and kiss my ass.
Mulder: Scully, you are the only one I trust.
Mulder: The truth will save you, Scully. I think it'll save both of us.
Mulder: [upon seeing the Cigarette Smoking Man in a hospital] Please tell me you're here with severe chest pains.
Reverend Finley: Sometimes we must come full circle to find the truth. Why does that surprise you?
Scully: Mostly, it just makes me afraid.
Reverend Finley: Afraid?
Scully: Afraid that God is speaking... but that no one's listening.
Scully: I have never met anyone so passionate and dedicated to a belief as you. It's so intense that sometimes it's blinding.
Susanne Modeski: No matter how paranoid you are, you're not paranoid enough.
Scully: Last time you were so engrossed, it turned out you were reading the "Adult Video News."
Mulder: If coincidences are coincidences, why do they feel so contrived?
Mulder: Sometimes the only sane answer to an insane world is insanity.
Mulder: We've both lost so much... but I believe that what we're looking for is in the X-Files. I'm more certain than ever that the truth is in there.
Scully: I've heard the truth, Mulder. Now what I want are the answers.
Scully: What if there was only one choice and all the other ones were wrong? And there were signs along the way to pay attention to.
Mulder: Mmm. And all the choices would then lead to this very moment. One wrong turn, and we wouldn't be sitting here together. Well, that says a lot. That says a lot, a lot, a lot.
Samantha Mulder: Do we have to watch this, Fox?
Mulder: Leave it. I'm watching "The Magician" at nine.
Samantha Mulder: Mom and Dad said I could watch some movie, Buttmunch.
Mulder: They're next door at the Gallren's and they said I'm in charge.
Mulder: Hey. Get out of my life.
Mulder: I'm watching The Magician.
Mulder: Now look. The fuse is blown.
Samantha Mulder: Fox!
Mulder: Samantha! Samantha!
Mr. X: I'm afraid I can't help you.
Mulder: Why?
Mr. X: The last time I helped you, I bloodied my fist and revealed my identity.
Skinner: [repeated closing phrase] That will be all.
[repeated line]
Mulder: Where is she?
Doctor: You're gonna have to tell me who you are first!
Caption: THE TRUTH IS OUT THERE
Caption: APOLOGY IS POLICY
Caption: THIS PROGRAMME IS NOT MADE ON BEHALF OF, OR WITH THE APPROVAL OF, THE FEDERAL BUREAU OF INVESTIGATION
Caption: TRUST NO-ONE
[repeated line]
Scully: But Mulder...