I'm bored. Here's a list:
Star Trek: "The Enemy Within"
Star Trek (animated): "The Slaver Weapon"
Star Trek: The Next Generation: "Cause and Effect"
Star Trek: Deep Space Nine: "In the Pale Moonlight" (for a paper on ethics!)
Star Trek: Voyager: probably "Tuvix"
Star Trek: Strange New Worlds: "Charades"
Star Trek: Prodigy: "Temporal Mechanics 101"
For all the rest, probably their series finales.