Supernatural (TV series)/Recap/S05/E06 I Believe the Children Are Our Future

Everything About Fiction You Never Wanted to Know.

Season 5, Episode 6:

I Believe The Children Are Our Future

Sam and Dean are called to investigate a series of Deadly Pranks and discover that a boy named Jesse is inadvertently warping reality to fit his beliefs about the world. Castiel appears and informs the brothers that Jesse is an Anti Christ and insists that they kill him, but they opt to tell him the truth and he vanishes, leaving only a note saying that he wishes to keep his family safe.