he investigation into a drug robbery gone wrong uncovers Voight's link to a missing teen; the real reason for Halstead's brother's visit becomes clear; and Platt cares for a young girl at district.
Jason Beghe Sergeant Hank Voight
Jon Seda Detective Antonio Dawson
Sophia Bush Detective Erin Lindsay
Jesse Lee Soffer Detective Jay Halstead
Patrick John Flueger Officer Kyle Ruzek
Marina Squerciati Officer Kim Burgess
Elias Koteas Detective Alvin Olinsky