The Murder of One

S3 E18: Damon and Stefan form a new plan to destroy Klaus, and they enlist Elena, Caroline and Matt to help. Klaus returns and forces Bonnie to perform a spell. He and Rebekah also convince a reluctant Finn to co-operate - but Rebekah has her own scheme to take revenge on Damon. Stefan is led into a dangerous confrontation with Klaus and, later, to a heartbreaking moment with Elena.