Season 3 Episode 11
"Knocked the Family Right Out"
Intelligence hunts down a crew responsible for a rape and robbery rampage; Lindsay is abducted on an undercover operation.
Intelligence investigates a violent home invasion and is shocked to learn that not only was the family fast asleep when the crime occurred but also that the teenaged daughter was assaulted while unconscious. The team discovers that the criminals used nitrous oxide to knock out the family, and that the case fits the profile of a crew that has been terrorizing their way across the country in a rape and robbery rampage. After Lindsay (Sophia Bush) reaches out to a contact from her party girl days, the team learns that a large score of nitrous oxide was recently stolen - and all the evidence points to one group of suspects. After going undercover to seek out the perpetrators with Halstead (Jesse Lee Soffer), Atwater (LaRoyce Hawkins), and Ruzek (Patrick John Flueger), the case looks closed when the ringleader of the crew is taken into custody. But then a false home invasion and rape is staged by the criminals in an effort to cover their tracks, and Lindsay unknowingly goes to a criminal's house and is abducted. Lindsay is saved when the team discovers the truth, and a dangerous showdown leaves one of the criminals dead and the others in custody.
Meanwhile, Voight (Jason Beghe) helps a former cellmate get back on his feet after his early release from prison. The cellmate, Eddie Little (guest star Clancy Brown), throws Voight for a loop when he inquires about becoming a confidential informant for Intelligence, claiming to have big news about a score on the streets.
At Molly's, Platt (Amy Morton) and Mouch (Chicago Fire's Christian Stolte) learn they'll have to amend their wedding plans after Platt finds out that her formerly rich father is now flat broke.