: Sacrificed himself to The Empty after expressing his love for Dean to save him from Death (Billie).

: Fans saw the return of Bobby Singer (Jim Beaver), Garth (DJ Qualls), Eileen Leahy (Shoshannah Stern), and even their half-brother Adam Milligan (Jake Abel). The Ending Explained: "Carry On"

The series finale was a two-part conclusion that gave each brother a distinct ending reflecting their character's nature.

Season 15 faced unprecedented challenges due to the global COVID-19 pandemic. While originally slated to end in May 2020, production was halted in March after filming only 18 of the 20 planned episodes.

: Jared Padalecki (Sam), Jensen Ackles (Dean), Misha Collins (Castiel), and Alexander Calvert (Jack/Belphegor).

: The show went on an extended break after the March 23, 2020, episode.