The X-Files/Recap/S02/E11 Excelsis Dei

When an orderly at the Excelcis Dei Nursing Home claims to have been raped by an elderly (and, what's more, invisible) in-patient, Scully insists on an investigation. Once there, they find that the patients seem unusually spry and lucid - until the accused rapist unexpectedly drops dead from a rare poison that he could not conceivably have access to. Could a revolutionary new treatment for Alzheimer's be responsible? Or are the spirits of the dead exacting horrible revenge for the abuses they suffered? And what is the role of Gung, the one orderly everyone seems to like?

Tropes
"Mulder: Whatever tape you found in that VCR, it isn't mine.
 * Cure for Cancer: Or, rather, Alzheimer's.
 * Drowning Pit
 * Foreign Language Title
 * Hey, It's That Guy!: the female orderly is Dr. Fraiser
 * I See Dead People: one (possible) effect of the mushroom-pills
 * Orderlies Are Creeps
 * Poltergeist
 * Porn Stash:

Scully: Good, because I put it back in that drawer with all those other videos that aren't yours."