THE VAMPIRE DIARIES Thursday, March 5th at 8pm on CW50 – THE MERGE — When Liv (guest star Penelope Mitchell) and Luke’s (guest star Chris Brochu) father arrives to town to celebrate their birthday, they try and convince him to let Jo (guest star Jodi Lyn O’Keefe) and Kai (guest star Chris Wood) take their place in the merge ceremony. After Tyler (Michael Trevino) finds out that the merge is happening sooner than he expected, he urges Liv to let him talk to her father. Meanwhile, after Caroline’s (Candice Accola) plan to cure her mother takes an unexpected and devastating turn, Elena (Nina Dobrev), Stefan (Paul Wesley) and Damon (Ian Somerhalder) gather at the hospital, while Jo attempts to save Sheriff Forbes’ (guest star Marguerite MacIntyre) life. Lastly, with the merge set to take place, Damon’s risky plan quickly sends things spiraling out of control, forcing one of the twins to take matters into their own hands. Jeffrey Hunt directed the episode written by Brett Matthews & Rebecca Sonnenshine (#612). Original airdate 1/29/2015.