Planning a TV show built around a central mystery without knowing how many episodes you’ll get to make can be frustrating for both creators and viewers. The solution seems obvious: plan for a specific number of seasons and episodes from day one, and stick to that plan no matter what. ShowtimeAccording to Variety, Showtime has renewed the survival thriller series Yellowjackets for Season 4. This comes about a month after Season 3 ended, and is a welcome update to fans worried that the delay meant the show was ending. This worried fans, as Yellowjackets’ showrunners have always said they had a five-season plan for the story.