Summary: Founder’s Day has finally arrived, and everyone is busy with last-minute preparations for floats and fireworks. Stefan is uncomfortable with Damon’s new attitude toward Elena, but Elena is more concerned about repairing her relationship with Jeremy. Jeremy is worried about Anna, but not sure he’s on board with her latest plan for the future. While Caroline is enjoying her day as Queen of the celebration, she also tries to help Matt and Tyler get their friendship back on track. Finally, although Damon and Alaric do their best to stop him, Johnathan Gilbert sets a plan in motion that brings Founder’s Day to an end amid chaos, destruction and death.

Isobel 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 Johnathan Gilbert has been searching for. Isobel’s dangerous actions lead Stefan, Damon and Bonnie to step in and help Elena deal with the situation.

While Stefan struggles to come to terms with his past, both he and Damon reveal parts of their history to Elena, until she finally learns the truth about how they became vampires. Pearl has an ugly confrontation with Johnathan Gilbert. Damon and Alaric try to find a mysterious invention before Johnathan does. The friendship and flirtation between Jeremy and Anna continues to grow.

At the Founder’s Day Gala, Elena and Caroline compete for the title of “Miss Mystic Falls” against other girls from town, including Tina Fell and Amber Bradley. Elena is happy to have Bonnie back in town, but Bonnie still has issues to work through. John Gilbert attempts to intimidate Damon, but his plan doesn’t have the desired effect. Damon discovers that Stefan is hiding a dangerous secret that could impact everyone in town.

Summary: Stefan tries to control his new situation; Jeremy and Elena receive a surprise visit from their uncle (David Anders); an incident at a party causes trouble between Tyler and Matt.

Airdate: 8 April, 2010 8:00 PM Eastern Standard Time Summary: When Stefan and Damon make a dangerous new enemy, Stefan suddenly finds himself in a perilous situation. Damon and Elena try to convince Alaric to work with them to help Stefan. Matt is hopeful that his mom, Kelly, may be back to stay. After her car breaks down in a storm, Caroline make a horrific discovery that shocks everyone in town.

Airdate: 1 April, 2010 8:00 PM Eastern Standard Time Summary: Anna brings a surprising guest on a visit to Damon; Elena and Stefan go on an awkward double date with Caroline and Matt; Jenna reunites with her old friend Kelly; Jeremy’s relationship with Anna takes an unexpected turn.

Airdate: 25 March, 2010 8:00 PM Eastern Standard Time Summary: Matt and Caroline are surprised by the sudden reappearance of Matt’s mother Kelly. Stefan and Elena are worried about Damon’s new attitude. Damon is asked by Sheriff Forbes to take part in a fund-raising bachelor auction. Alaric discovers shocking secrets from his own past. With help from Jenna and Stefan, Nina is determined to find out everything she can about her birth mother, but the truth may be more than she can handle.

Summary: Stefan helps Elena, and Bonnie out of a dangerous situation. Jeremy asks Anna to a party in the woods, unaware that she has her own reasons for wanting to meet him there. When Stefan, Damon, and Elena work with Bonnie and Grams to open the tomb, everyone is shocked by what they discover.

In flashbacks, Stefan and Damon recall the long-ago actions taken by townspeople including their father, Guiseppe Salvatore, and Pearl, leading to the devastating events that caused the rift in their relationship. In the present, Bonnie’s date with Ben takes a frightening turn. Elena helps Stefan as he and Damon race to find the missing journal that belonged to Elena’s ancestor. Stefan learns the reason behind Alaric’s interest in both the journal and the town’s history. Damon discovers that an old acquaintance has returned to town with an agenda he understands.