While Stefan struggles to control his new situation of blood lust after feeding off Elena's blood to heal, she and Jeremy are surprised by a visit from their uncle, John Gilbert, who arrives in Mystic Falls with an agenda. Meanwhile, Alaric has an awkward talk with Elena about his wife Isobel. At a Founder's Day event, Stefan displays a rare party attitude and Damon's attempt to find out why Uncle John has returned to town takes an ugly turn. An incident at the party causes trouble between Matt and Tyler, and the relationship between Matt and his immature and irresponsible mother, Kelly, reaches a new low. Elsewhere, Elena's effort to comfort Jeremy in the wake of Vicki's murder falls short and he decides to take matters into his own hands to track down the vampire who killed her.