Deanna Reed-Foster

Dawson faces a difficult decision regarding a father with an addiction to painkillers; Herrmann runs into trouble with a police officer; Otis and Cruz are determined to find out who Brett is dating; Donna's brother makes a surprise appearance.

Kidd is forced to deal with the unpredictable actions of her ex, while Chief Boden struggles with Jimmy, and Dawson faces a decision on her foster care with Louie.

Severide agrees to a bone marrow donation; Casey and Dawson attempt to find harmony at home; Otis and Mouch plan to create a PSA to encourage people to join the Chicago Fire Department.

Casey helps Dawson continue her search for Bria; Lt Severide and Chief Grissom reunite; Zach and Kidd go on a date; Cruz enlists Mouch and Brett to help create a new tool.

Severide considers an interesting proposition from a former firefighter turned medical student; Casey and Dawson face hurdles trying to permanently adopt Louie; Otis persuades Herrmann to throw a centennial celebration for the bar.