In the November 2018 episode "The Switch," Sergeant Grey reassigns the rookies to new training officers, putting their skills and interpersonal trust to the test. The episode features key developments, including John Nolan's high-stakes arrest, a critical relationship breakup for Lucy Chen, and a solidified bond between the rookies and their superiors. For more details, visit The Rookie Wiki . The Rookie Season 1 Episode 4 Review: The Switch