Yellowjackets, the Showtime series about a high-school girls’ soccer team stranded in the wilderness after a plane crash, can be extremely stressful to watch. The drama, which ended its first season tonight and has been renewed for a second, is relentlessly violent, and the writers seem to delight in attacking or killing off the most lovable characters. The aggressively knotty narrative braids together two timelines: One, set in 1996, follows the squad after the accident and involves drug-induced visions, a close encounter with a bear, and—eventually, per a flash-forward—a cannibalistic cult led by a masked character wearing antlers on her head. The other, set in the present day, tracks the survivors as middle-aged adults who get targeted by a blackmailer. At times, Yellowjackets’ many preposterous story beats have risked derailing the show.