S9·E4 Slumber Party

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S9E4 (Slumber Party).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
No invented titles, names, dates, counts, awards, ratings, etc.
No guessing or inventing plot points.
Original, neutral, encyclopedic prose.
Plain text only (no markdown, no asterisks, no headings, no bullet points).
Word count target: 280-380 words.
Synopsis: Sam and Dean, with help from Charlie, inadvertently release two individuals from the Men of Letters bunker. These individuals were imprisoned in 1935. One individual is identified as Dorothy of Oz, who is searching for the Wicked Witch of the West.
Sources:
[1] TMDB: Series title Supernatural (2005).
[2] Wikipedia: Created by Eric Kripke. Broadcast on The WB and The CW for 15 seasons (Sept 13, 2005, to Nov 19, 2020). Follows brothers Sam (Jared Padalecki) and Dean (Jensen Ackles).
[3] IMDb: Cast and crew info.
[4] TMDB Cast: Sam and Dean Winchester lost their mother to a demonic force; father raised them to hunt paranormal evil.
[5] Simple English Wikipedia: Horror, drama, fantasy, fiction series created by Eric Kripke.
The synopsis is extremely brief.
The sources provide context about the series (creators, actors, general premise) but do not provide more specific plot details for S9E4.
Problem: The user wants a 280-380 word recap. The provided synopsis is only about 45 words.
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 instruction to "stay concise rather than guessing" when the synopsis is sparse, I cannot reach the 280-380 word count without violating the "never invent or guess" rule.
However, I must attempt to meet the user's request while adhering to the strict "verifiable facts" rule.
Let's see what I can include:
Series: Supernatural.
Characters: Sam Winchester (Jared Padalecki), Dean Winchester (Jensen Ackles), Charlie.
Setting: Men of Letters bunker.
Plot: Sam and Dean, assisted by Charlie, release two individuals from the bunker. These individuals were imprisoned in 19