1.04 - Family Ties

Elena asks a reluctant Stefan to go with her to the annual Founder's Park dance. Vicki gets Tyler to ask her, but later accuses him of hiding their drug-induced relationship from his aunt Jenna. Meanwhile, Zach reveals a family secret to Stefan. Damon finally tells Elena the secret history about the Salvatore family and how she is the dead-splitting image of Stefan's lost love. Stefan tries to get Damon out of his life for good without giving away Damon's (or his) secret. Also, Elena thinks that Caroline is being abused by Damon when she sees the bite marks on her neck and tries to get her some help.

Source: IMdb