S7·E21 Reading is Fundamental

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S7E21 ("Reading is Fundamental").
Constraint 1: Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Constraint 2: Do not invent/guess titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points.
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: Meg calls Dean and Sam to tell them Castiel is awake and talking. A teenager named Kevin gets hit by a bolt of lightning and becomes a reluctant prophet. Sam and Dean believe Kevin holds the key to defeating the Leviathans. They must fight off two Archangels who want him for their own purposes.
Sources:
[1] TMDB: Series overview (Sam and Dean Winchester).
[2] Wikipedia: Series broadcast dates (Sept 13, 2005 - Nov 19, 2020), networks (The WB, The CW), actors (Jared Padalecki as Sam, Jensen Ackles as Dean).
[3] IMDb: Creator (Eric Kripke), actors (Jared Padalecki, Jensen Ackles, Jim Beaver, Misha Collins).
[4] TMDB Cast: Backstory (lost mother to demonic force, father raised them as soldiers).
[5] Simple English Wikipedia: Genre (horror, drama, fantasy, fiction), creator (Eric Kripke), networks (The WB, The CW), actors (Jared Padalecki as Sam, Jensen Ackles as Dean).
Episode Specifics:
Characters: Meg, Dean, Sam, Castiel, Kevin.
Plot: Meg informs Sam and Dean that Castiel is awake and talking. Kevin, a teenager, is struck by lightning and becomes a reluctant prophet. Sam and Dean think Kevin is the key to defeating the Leviathans. Two Archangels want Kevin for their own purposes.
Series Context (to help reach word count if needed, but must be careful not to drift from the episode):
Sam Winchester is played by Jared Padalecki.
Dean Winchester is played by Jensen Ackles.
The series was created by Eric Kripke.
The series follows brothers Sam and Dean Winchester as they hunt demons, monsters, and other supernatural beings.
Drafting - Attempt 1:
In the episode Reading is Fundamental, Meg contacts Sam and Dean Winchester to inform them