S6·E16 ...And Then There Were None

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S6E16 (...And Then There Were None).
Constraint 1: Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Constraint 2: No inventing/guessing titles, names, dates, etc.
Constraint 3: Original, neutral, encyclopedic prose.
Constraint 4: Plain text only (no markdown, no asterisks, no headings, no bullet points).
Constraint 5: Word count: 280-380 words.
Constraint 6: If the synopsis is sparse, stay concise rather than guessing.
SYNOPSIS: Eve, the Mother of All, unleashes a new monster: a black worm-slug that enters the brain and forces people to kill. Sam and Dean join forces with Bobby and Rufus and track it to a cannery. Gwen and Samuel are also there looking for the monster. None of them know who the monster is inside.
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). Sam (Jared Padalecki) and Dean (Jensen Ackles) Winchester.
[3] IMDb: Cast and crew credits.
[4] TMDB Cast: Sam and Dean lost mother to demonic force; father raised them as soldiers to kill paranormal evil.
[5] Simple English Wikipedia: Horror, drama, fantasy, fiction series.
Episode Title: ...And Then There Were None
Series: Supernatural
Characters: Sam Winchester, Dean Winchester, Bobby, Rufus, Gwen, Samuel, Eve (the Mother of All).
Plot: Eve unleashes a black worm-slug monster. It enters the brain and forces people to kill. Sam and Dean team up with Bobby and Rufus. They track the monster to a cannery. Gwen and Samuel are also at the cannery looking for the monster. The group does not know which individual is the monster.
The synopsis is very short. The instructions say: "If the synopsis is sparse, stay concise rather than guessing."
The word count requirement is 280-380 words.
Conflict Check: If I only use the provided facts, I will struggle to reach 280 words without being repetitive or "guessing."
Let's look at the facts again.
Series: Supernatural (2005).
Creators: Eric Kripke.
Cast: Jared Padalecki (Sam Winchester), Jensen Ackles (Dean