Kevin Nichols

In flashbacks, Stefan reveals to Elena the Salvatore family history, including how his rivalry with Damon began. In the present, Damon impulsively takes control of Vicki's future.

Stefan gets a surprise birthday visit from an old friend, Lexi (ARIELLE KEBBLE - The Grudge 2, Gilmore Girls). Caroline tries to get Damon's medallion back from Bonnie.

In the season finale, 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 (recurring guest star MALESE JOW), 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, John Gilbert (recurring guest star DAVID ANDERS) sets a plan in motion that brings Founder's Day to an end amid chaos, destruction and death.

Tyler learns more about the Lockwood family curse from Mason. Stefan and Damon argue over how to handle Mason. Elena tries to keep Jeremy from becoming more involved with the Lockwood mystery, but Jeremy makes an effort to hang out with Tyler. Mason gives Sheriff Lockwood some startling information, leading to a night of violence, confession and heartbreak.

When a beleaguered Jane spills hot coffee on a stranger, a viral video of Jane's bad day potentially jeopardizes her career and reputation. Meanwhile, the squad rushes to solve a puzzling murder case involving a conspiracy theorist.