<Tr> <Th> 100 </Th> <Td> 11 </Td> <Td> "500 Years of Solitude" </Td> <Td> Chris Grismer </Td> <Td> Julie Plec & Caroline Dries </Td> <Td> January 23, 2014 (2014 - 01 - 23) </Td> <Td> 2J7511 </Td> <Td> 2.72 </Td> </Tr> <Tr> <Td_colspan="8"> Nadia is trying to save her dying mother, Katherine, and comes up with a frightening plan . Elena and Stefan are forced to help Nadia to enact her plan after Nadia threw Matt in the safe which Stefan spent the summer locked in . Bonnie, Caroline and Jeremy search for Matt's location, but the returning Rebekah saves him . Katherine, who continues to fight for her life, remembers her time in Bulgaria back in 1492 . Klaus also returns and confronts Caroline to admit her feelings for him; this later results in them sleeping together . After Nadia leads them, Elena and Stefan are trapped in a house full of travelers who are doing an unknown ritual . However, Elena and Stefan are able to escape, and later Elena goes to Katherine to forgive her for all the bad things that she did to her . Tyler returns as well and he catches up with the group . Upon her speech, Katherine attacks Elena and finish the ritual, officially becoming a traveler in Elena's body . </Td> </Tr> <Tr> <Th> 101 </Th> <Td> 12 </Td> <Td> "The Devil Inside" </Td> <Td> Kellie Cyrus </Td> <Td> Brett Matthews & Sonny Postiglione </Td> <Td> January 30, 2014 (2014 - 01 - 30) </Td> <Td> 2J7512 </Td> <Td> 2.42 </Td> </Tr> <Tr> <Td_colspan="8"> In order to give Katherine permanent control over Elena's body, Nadia's friend Mia plans to cast a spell for which she needs to use Katherine's corpse . However Damon has already buried it himself, in the tomb where Katherine was supposed to have been buried alive in the 1800s . Katherine compels Matt to give her personal information about Elena so that she can impersonate her at Tyler's welcome home party, and hopefully learn the whereabouts of her corpse . Caroline reveals to Katherine (posing as Elena) that she slept with Klaus, which Tyler overhears and becomes extremely angry and hurt . Enzo brings Aaron Whitmore to Damon, who tells him to complete his killing streak and kill him (just like his parents and grandparents), however Damon declines . Katherine and Nadia are able to find Katherine's corpse, and then complete the spell . Later, Katherine (possessing Elena) breaks up with Damon, which angers Damon and causes him to attack Aaron in the final scene . </Td> </Tr>

How many seasons of vampire diaries are ther