Sort by Air Date of "Next episode to Watch"
Useful when catching up on related shows that crossover a lot, like Arrowverse (Arrow, Flash, Supergirl, Legends of Tomorrow).
Or any set of shows with shared continuity where stuff that happens in one might affect the other, even without a straight-up crossover. Ex. Star Trek (Next Gen, DS9, Voyager) or Stargate (SG1, Atlantis)