S15·E1 Back and to the Future

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S15E1 (Back and to the Future).
Constraint 1: Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Constraint 2: Do not invent/guess titles, names, dates, counts, awards, ratings, etc.
Constraint 3: If a detail is not in the material, omit it.
Constraint 4: Write original, neutral, encyclopedic prose in plain text.
Constraint 5: No markdown, no asterisks, no headings, no bullet points.
Constraint 6: Word count target: 280-380 words.
SYNOPSIS: "Picking up here we left off last season, Sam, Dean and Castiel are left to defend the world after all the souls in hell have been released and are back on Earth and free to kill again."
SOURCES:
[1] Series title: Supernatural. Genre: Drama, Mystery, Sci-Fi & Fantasy.
[2] Creator: Eric Kripke. Network: The WB and later The CW. Seasons: 15. Dates: September 13, 2005, to November 19, 2020. Characters: Sam Winchester (played by Jared Padalecki) and Dean Winchester (played by Jensen Ackles).
[4] Plot background: Sam and Dean Winchester lost their mother to a mysterious and demonic supernatural force. Their father raised them to be soldiers to kill paranormal evil.
[5] Genre: Horror, drama, fantasy, fiction.
Episode Title: Back and to the Future (S15E1).
Characters involved in the episode (from synopsis): Sam, Dean, and Castiel.
Plot point: The episode picks up from where the previous season ended.
Conflict: All souls in hell have been released and are back on Earth, free to kill again.
Goal: Sam, Dean, and Castiel are left to defend the world.
The synopsis is extremely brief.
The sources provide general series information (creator, cast, general premise) but very little specific episode detail.
The prompt asks for a 280-380 word recap.
Problem: The provided synopsis only contains about 40 words of actual plot information for this specific episode.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing." and "Write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES."
If I follow the instructions strictly, I cannot reach 280 words without inventing facts, which is forbidden.
However, I can incorporate the series context provided in the sources