S6, E6: When Alaric realizes that Jo (recurring guest star Jodi Lyn O’Keefe) can’t be compelled, he asks Elena to do some digging into her background. After learning that Enzo has been captured by Tripp (recurring guest star Colin Ferguson), Caroline teams up with Matt and Stefan to rescue him before Tripp learns their true identities. Armed with some new information about her past, Sarah (recurring guest star Gabrielle Walsh) breaks into Tripp’s office and is surprised when she finds Matt there, doing some investigating of his own. Meanwhile, Elena is forced to deal with the consequences of her actions, and Jeremy hits rock bottom, lashing out in a destructive way. Lastly, Damon is determined to take matters into his own hands when he receives some upsetting news.