The Rookie | Going Under (I)
Director: Alexi Hawley
Cast: Alyssa Diaz, Eric Winter, Jenna Dewan, Mekia Cox, Melissa O'Neil, Nathan Fillion, Richard T. Jones, Shawn Ashmore, Tru Valentino
Description: : Officer Lucy Chen goes undercover to infiltrate an illegal firearm operation, and Detective Harper and Officer John Nolan work together to solve a mystery involving severed limbs found around the city. The crossover continues on The Rookie: Feds S01E21 Bloodline (II).