CW | 8:00 pm

Sam and Dean (Jared Padalecki, Jensen Ackles) are on a deadly collision course with Chuck (recurring guest star Rob Benedict) — better known as God — as the brothers Winchester return to complete their 15th and final season. In the first of these new episodes, "Last Holiday," however, the guys discover a temperamental wood nymph (guest star Meagen Fay) is now living in their bunker — and she's determined to protect her family at any cost.