Plot summary
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.
Credits
Adapted from Wikipedia contributors, The Vampire Diaries season 5. HTML formatting and reference markers removed.