Stiles and Lydia are both wasted and they get together for a night. The next morning, neither of them remember anything. Lydia buys a pregnancy test and finds out she is pregnant.

Lydia discovers she's pregnant, but the situation becomes more complicated as the Dread Doctors learn about their unborn child, who is half-human and half-banshee. The pack is faced with the daunting task of protecting both Lydia and Stiles' baby. How far will they go to ensure their safety? Takes place after the events of 5x16.