As Sarah and Luc's wedding draws near, the Walker's learn the true meaning of family.
Brad strikes a deal with Sykes and Richards to stay with Amy at Project NOAH as they begin to test the virus on her; Brad learns some harsh truths regarding the state of inmates in 4B; Babcock sheds light on her past.
Wolgast convinces Sykes and Lear to let him and Amy outside of the facility for exercise; Fanning's hold on those kept inside Project Noah grows stronger; the virals gain power over the facility's staff.