An investigation leads Harken and Hicks to go undercover in a secret, underground Alphas-only Fight Club.

While investigating a string of crimes, the team realizes that they are looking for Nina, who had gone AWOL, and try to stop her before she hurts herself.

Rosen enlists Skylar's help to decode Parish's Alpha technology and endangers her life and the life of her daughter.

Rosen discovers the identity of the mole; Kat tracks a mysterious new street drug that makes users temporarily invincible.

While the team tries to cope with Danielle's death, a mysterious woman drops a baby off at the office and Gary is strangely drawn to protecting it.

Rosen kidnaps and interrogates an Alpha prisoner; Harken and Gary search for Skylar.

Rosen seeks a final confrontation with Alpha leader Stanton Parish.