Watch The Vampire Diaries Season1 Episode21 "Isobel" online free streaming video. Isobel returns to town and stuns Alaric (Matt Davis) 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 Johnathan Gilbert has been searching for. Isobel’s dangerous actions lead Stefan , Damon and Bonnie (Katerina Graham) to step in and help Elena deal with the situation.