The 15th season of Supernatural explores several themes, including mortality, family, and the consequences of one's actions. The season's storyline revolves around the character of Lucifer, who has returned to Earth and is seeking to bring about the apocalypse. The brothers Winchester must navigate their relationships with each other and with other characters, all while facing their own mortality. The theme of mortality is particularly significant, as the season marks the final chapter in the series.
The characters undergo significant development throughout the series. Sam and Dean's bond is tested and strengthened by their shared experiences, and they are joined by a diverse cast of allies, including: The 15th season of Supernatural explores several themes,