The Number of Rats

The Number of Rats
Season:	2
Episode:	20
Original airdate:	April 29, 2015
Teleplay by:	Matt Olmstead Cole Maliska
Story by:	Matt Olmstead Warren Leight
Directed by:	Nick Gomez
Episode chronology
Previous episode:	The Three G's
Next episode:	There's My Girl

The Number of Rats is the twentieth episode of the second season, the 35th overall episode of Chicago P.D. and the 102nd episode of the Chicago Franchise.

Summary

Benson has traveled into Chicago to help Voight and intelligence with a rape/murder case that is frighteningly similar to a case from New York a decade ago. She calls in Fin and Amaro to assist. The prime suspect, Yates is let go after rigorous questioning. He then requests a meeting with Lindsay and he warns of unintended consequences from what intelligence is doing.

Cast

Main Cast

• Jason Beghe as Sergeant Hank Voight
• Jon Seda as Detective Antonio Dawson
• Sophia Bush as Detective Erin Lindsay
• Jesse Lee Soffer as Detective Jay Halstead
• Patrick John Flueger as Officer Adam Ruzek
• Marina Squerciati as Officer Kim Burgess
• LaRoyce Hawkins as Officer Kevin Atwater
• Amy Morton as Desk Sergeant Trudy Platt
• Brian Geraghty as Officer Sean Roman
• Elias Koteas as Detective Alvin Olinsky

Special Guest Stars

• Mariska Hargitay as Sergeant Olivia Benson
• Danny Pino as Detective Nick Amaro
• Ice-T as Detective Odafin "Fin" Tutuola
• Peter Scanavino as Detective Dominick Carisi, Jr.

Guest Stars

• Dallas Roberts as Doctor Gregory Williams Yates
• Stella Maeve as Nadia Decotis
• Nick Gehlfuss as Doctor Will Halstead
• Samuel Caleb Hunt as Craig "Mouse" Gurwitch
• Jesse Spencer as Lieutenant Matthew Casey
• Eamonn Walker as Battalion Chief Wallace Boden

Co-Stars

• Rachel Melius as Charlotte Reegan
• Laura Lapidus as Janine
• Jeff Parker as Doctor Smith
• Tiffany Bedwell as Victoria Lewyn

Crew

• Dick Wolf as Creator
• Matt Olmstead as Creator
• Michael Brandt as Developer
• Derek Haas as Developer
• Dick Wolf as Executive Producer
• Matt Olmstead as Executive Producer
• Danielle Gelber as Executive Producer
• Michael Brandt as Executive Producer
• Derek Haas as Executive Producer
• Mark Tinker as Executive Producer
• Peter Jankowski as Executive Producer

Background information and Notes

• Crossover event that begins with the Chicago Fire episode "We Called Her Jellybean", continues with the Chicago P.D. episode "The Number of Rats" and concludes with the Law & Order: Special Victims Unit episode "Daydream Believer".

• A special opening narration was used for this episode of Law & Order: Special Victims Unit and Chicago P.D.:

“	In the criminal justice system some killers are so depraved that it takes multiple police agencies to bring them to justice. This is one of those investigations.	”
–Steve Zirnkilton

Episode scene cards

• This crossover adopted the Law & Order style of using scene cards both for the SVU and Chicago P.D. episodes.

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