Law & Order (1990) (1990)

S6E13 Charm City (I)

When a gas attack occurs in a subway station, echoing a similar incident from five years prior in a Baltimore church, detectives Tim Bayliss and Frank Pembleton travel to New York to lend their expertise to Briscoe and Curtis. This storyline unfolds further in the episode "For God and Country (II)" from Homicide: Life on the Street Season 4, Episode 12.