As The Flag Smashers escalate their efforts, Sam and Bucky take action.

John Walker is named Captain America, and Sam and Bucky team up against a rebel group.

Sam and Bucky go to a criminal safe haven to find information about the Super Soldier serum.

John Walker loses patience with Sam and Bucky as they learn more about Karli Morgenthau.

John Walker faces consequences for his actions, and Sam and Bucky return to the U.S.

Casey steps up to help a teenager being bullied by a gang; Severide bonds with a detective’s son after her life is threatened; and Kidd and Herrmann go head-to-head in…