Derailed — [s1e9]

The episode "[S1E9] Derailed" is a standout installment from the first season of Criminal Minds , originally airing in November 2005. Set aboard a passenger train traveling from El Paso to Dallas, it delivers a high-stakes hostage situation that tests the BAU's ability to negotiate with a mind untethered from reality.

The episode begins with Special Agent Elle Greenaway on what should have been a routine business trip to Dallas for a custodial interview with a convicted child murderer. Her journey is interrupted when a passenger, Dr. Theodore "Teddy" Bryar—a former renowned physicist—suffers a severe psychotic break. [S1E9] Derailed

The tension of the episode is amplified by the eclectic group of hostages, each carrying their own "baggage" that complicates the negotiation: The episode "[S1E9] Derailed" is a standout installment