This is a very unusual episode of Fringe. Anxiety caused by Peter's disappearance leads Walter to smoke some funky marijuana. Walter then tells Olivia's niece a story, and his imagination becomes the setting for a musical mystery put on by the rest of the Division.
Elena faces a major event in her life on next week's episode of The Vampire Diaries: she meets her birth mother for the first time. But Isobel's agenda includes a lot more than just sharing a moment with her daughter.