Lt. Casey and Dawson volunteer to help at a charity run at Chicago Medical when a massive explosion sends Chicago into chaos. With one of their own missing in the blast, the firehouse is tested like never before. (8:30 PM (2) aired on Chicago P.D., s... (more)eason 1, episode 12.)

Aimee Laurence, Amanda Righetti, Avi Lake, Christine Evangelista, Dylan Baker, Francis Guinan, Jason Beghe, Jesse Lee Soffer, Jon Seda, LaRoyce Hawkins, Marina Squerciati, Randy Flagler, Sammy Sheik, Sophia Bush