S7·E18 Party On, Garth

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S7E18 (Party On, Garth).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
No invented titles, names, dates, counts, awards, ratings, numbers, or plot points.
Omit details not in the material.
Style: Original, neutral, encyclopedic prose, plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
Synopsis: Dean gets a call from Garth asking for help on a case. Sam and Dean discover they are battling a Shojo, a Japanese creature sent to seek revenge on enemies. The Shojo can only be seen when one is drunk.
Sources:
[1] TMDB: General info.
[2] IMDb: Cast/crew info.
[3] Wikipedia: Created by Eric Kripke. Aired on The WB and The CW. 15 seasons. September 13, 2005, to November 19, 2020. Sam (Jared Padalecki) and Dean (Jensen Ackles) Winchester.
[4] TMDB Cast: Sam and Dean lost their mother to a demonic force. Father raised them as soldiers to kill paranormal evil.
[5] Simple English Wikipedia: Horror, drama, fantasy, fiction. Created by Eric Kripke.
Episode Specifics:
Characters: Dean Winchester, Sam Winchester, Garth.
Creature: Shojo (Japanese creature seeking revenge).
Mechanic: Can only be seen when drunk.
Plot: Garth calls Dean for help with a case. Sam and Dean investigate.
Problem: The synopsis is extremely brief. I need to reach 280-380 words using only the provided facts.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing."
Conflict: The user wants 280-380 words, but the provided text only contains about 50 words of specific plot information. If I strictly follow "Use only supplied facts" and "If the synopsis is sparse, stay concise rather than guessing," I cannot reach 280 words without violating the "never invent or guess" rule.
Strategy: I will include the series context provided in the sources (creator, network, main characters, premise) to build the word count, then detail the episode's specific plot points.
Drafting Content:
Series context: Supernatural is an American dark fantasy, horror, drama, and fiction television series created by Eric