Every TOS episode: WHO CRIED FOR DAMOCLES - S2 E45 - Kirk falls in love with the wife-daughter of a God. He hits and and quits it, jeopardizing his entire crew the process. Spock tolerates 42 minutes of slurs from a drunk southern doctor. Scotty kills another girlfriend.
Every TNG episode: PERTURBANCE - S4 E09 - Worf is shamed publicly for not being hit in the nuts with the right kind of knotted rope. Wesley is back from Starfleet for the fifth time to just kinda fart around. Data experiments with a cuckold fetish by watching someone else use a toaster of his own design.
Every Voyager episode: THE RAPHAEL FACTOR - S52 E209 - Janeway is forced to choose between saving a rare race of mosquito that creates wormholes to earth and a wormhole to earth. She somehow chooses an option that adds eighty more years onto their trip home and another folio in the Time Polices file on her. Paris gets into the Pokémon TCG but gives up when Neelix discovers the 2008 Gallade meta somehow
Every DS9 Episode: MYSTERIZING - S6 E19 - A character from a season 3 episode you missed in syndication is back, and you're pretty sure there are jokes you aren't getting. Odo has to question his loyalties to goo town. Garak tortures someone and Bashir gets off on it. Sisko tries a new hobby and unleashes an ancient spirit that threatens the station. O'Brien gets crucified. Worf is there.
Every Enterprise Episode before 9/11: The Rejoindering - S1 E15 - Captain Archer makes first contact with uhhhhh, the Pakled. Sure. He gives them five iconic catchphrases and then sets off to continue planting apple trees across the galaxy.
Every Enterprise Episode After 9/11: DEATHPLAN - S3 E6 - Archer questions the ethics of selling F14s to the Kurdassaians to help fight The Axis of Space Evil. Meanwhile in the Axis of Space Evil, the Peacetonians, the Loveanians, and the Collaborationtrons begin to suspect the Grand Hatemonger might have alterior motives....