Supernatural
Fifteen years without an opening title sequence, and fifteen distinct title cards instead — a few seconds of the show's name, restyled from scratch every season to match what that year was about. The shortest main titles on this site, and the ones that changed the most.
Seasons 1–15
Every season card in order. There was never a sequence to cut — the show goes from cold open to a card lasting a few seconds and straight into the episode — so the only way to watch the titles is to watch them consecutively. Special episodes were given their own cards on top of these.