Just interested if there’s an episode of a particular series you find yourself going back to? Not necessarily “the best” or your favorite, just one you gravitate toward for a comfort re-watch? Here’s the episodes from each series I find myself re-watching a lot:

TOS: Mirror, Mirror (instant classic, love the episode)

TNG: The Offspring (favorite Data episode, gives me a lump in the throat)

DS9: The Visitor (similar feeling to The Offspring)

VOY: Blink of an Eye (brilliant episode, even if it apparently rips off a novel but it’s cool to see the concept on TV)

ENT: Similitude (love the drama, love the theme and emotions)

DIS: Need to rewatch the first four seasons to find an episode that I’d want to rewatch

PIC: Vox (Okay, for the ENT-D reveal…)

SNW: Momento Mori (the first season is way better than the second season, and this episode is really cool IMO)

Haven’t seen enough of TAS, Prodigy, and Lower Decks to select any.