Michael Roark

Maggie and Meredith disagree with Derek about the best way to approach a patient's case, which leads to a bigger argument between the couple. Meanwhile, Callie feels responsible when one of her veterans is pushed too far and one doctor's routine procedure results in a devastating diagnosis, on the winter finale.

Isobel returns to town and stuns Alaric with her attitude. When Isobel and Elena finally meet, Isobel refuses to answer most of Elena's questions, but reveals that she will stop at nothing to find the mysterious invention John Gilbert has been searching for.

Elena and Alaric both lash out at John when Isobel's unexpected arrival leaves Jenna devastated. Bonnie works with Damon and Jeremy to find the spell they'll need to harness her ancestors' power. Plus, Stefan and Damon realise they have a new secret weapon.

After Abbie's sister escapes from a psychiatric hospital, Ichabod helps Abbie search for her; Ichabod and Abbie learn more about the evil they are facing, including its name.

When an unidentified, sickly boy is found in town, Ichabod and Abbie learn something disturbing is going on.

Capt. Irving turns to Crane and Mills for help when evil forces target his daughter, a frightening chapter of Jenny's past is exposed.