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Scully comes to terms with her cancer diagnosis. Mulder investigates the possibility that it's linked to her abduction experience.
- Affably Evil: Doctor Scanlon. On the surface he is a friendly, caring doctor who treated all the abductees, trying to cure them of their cancer. Secretly he is working for The Syndicate and isn't actually treating them, but worsening their conditions and killing them all, taking advantage of their trust in him in a total betrayal of his status as a medical professional.
- Anywhere but Their Lips: Mulder kisses Scully on the forehead.
- Artistic License Medicine: Scully undergoes aggressive chemo and radiation therapy without showing any of the usual overt symptoms. She doesn't even lose a single hair. Justified because her "doctor" is not really trying to treat the cancer and is only putting on a show of treatment to kill her and the others.
- Cloning Blues: Mulder encounters another batch of alien hybrid clones.
- The Conspiracy: The MUFON members' illnesses and deaths are linked to the Syndicate.
- Deadly Nosebleed: Scully, several times throughout the episode.
- Deal with the Devil: Skinner advises Mulder to avoid talking with the Cigarette Smoking Man about Scully's condition because it will amount to this, instead ordering him to find another way to save her. However, when it becomes clear that the CSM is the only one who might be able to help, Skinner takes it on himself to make the deal.
- Diary: Scully keeps one, and she writes her entries as a letter to Mulder.
- Flashback Nightmare: Scully has one, flashing back to her abduction.
- Foreign Language Title: "Memento Mori" is a Latin phrase meaning "remember that you must die."
- Held Gaze: Mulder and Scully look at each other with smiles on their faces before the big hug in the hospital.
- Stock Episode Titles
- The Password Is Always "Swordfish": The password to access records at the reproductive medicine facility is on a snowglobe beside the computer.
- The Topic of Cancer: Eventually subverted by Scully, affirming that people live with cancer every day and that she intends to do the same.
- Your Days Are Numbered: Scully deals with her cancer and undergoes several chemotherapy treatments.
Cigarette Smoking Man: Yes I believe there is, if you're willing to pay the price.