When Liv and Luke's father arrives to town to celebrate theirbirthday, they try and convince him to let Jo and Kai taketheir place in the merge ceremony. After Tyler finds out thatthe merge is happening sooner than he expected, he urges Livto let him talk to her father. Meanwhile, after Caroline'splan to cure her mother takes an unexpected and devastatingturn, Elena, Stefan and Damon gather at the hospital, whileJo attempts to save Sheriff Forbes' life. Lastly, with themerge set to take place, Damon's risky plan quickly sendsthings spiraling out of control, forcing one of the twins totake matters into their own hands.