Michael Roark

Isobel (recurring guest star Mia Kirshner – The L Word, 24) returns to town and stuns Alaric with her attitude and her demands that he arrange a meeting with Elena. When mother and daughter 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. Isobel's dangerous actions lead Stefan, Damon and Bonnie to step in and help Elena deal with the situation.

Dr. Hope Martin returns to ask Maura for a favor; Jane worries about Lt. Col. Jones' spinal surgery; Tommy shows off baby T.J.; a building collapses.

Elena and Alaric both lash out at John (recurring guest star David Anders) when Isobel’s (recurring guest star Mia Kirshner) unexpected arrival leaves Jenna devastated. Bonnie works with Damon and Jeremy to find the spell they’ll need to harness her ancestors’ power, and a heartbroken Caroline doesn’t know what to do about Matt. Plus, Stefan and Damon realize they have a new secret weapon.