In the category of "underrated but headline-grabbing," we have this NBC time-travel drama. Packed with complicated characters and compelling storylines, the show figured out exactly how to balance an old-fashioned time-travel caper with bold character beats for its diverse, detailed cast. The beloved but low-rated show became one of the biggest "save our show" stories of the decade when it defeated cancellation not once, but twice: NBC cancelled the show after its first season due to high costs and low ratings, only to reverse the decision days later, and after cancelling the show again following a cliffhanger-y season two, fans rallied to get a satisfying two-hour wrap-up movie.