 Scott McCall (Tyler Posey) and Allison Argent (Crystal Reed) conceal their renewed relationship from Allison's parents, who oppose it because they know Scott is a werewolf.Lydia Martin (Holland Roden) suffers chronic hallucinations since bitten by Peter Hale (Ian Bohen), now dead because Derek Hale (Tyler Hoechlin) killed him to become the new Alpha werewolf.Derek recruits abused teen Isaac Lahey (Daniel Sharman) into his pack.