Elena (Nina Dobrev), Stefan (Paul Wesley) and Damon (Ian Somerhalder) try to find out why the Gilbert device affected the Lockwood family as well and they ask for Alaric's (Matt Davis) help since he might know something from Isobel's research.
To find out more about it, Alaric, Elena and Damon leave for Duke University where Isobel's research results are while Stefan stays behind to help Caroline (Candice Accola) adjust to her new life as a vampire.
Meanwhile, Tyler (Michael Trevino) follows his uncle into the abandoned dungeon because he wants to know what he is hiding but he only finds scratches on the wall.
She acts friendly when they come and tells them about Isobel's research but when she gets out of the room she returns with a crossbow and shoots Elena.
Damon jumps in front of Elena just in time and the arrow hits him while Alaric disarms Vanessa.
In the meantime, in the next room Vanessa tells Alaric that Katherine and Damon are dead and they cannot be standing in front of her.
Meanwhile, Mason (Taylor Kinney) is back at the dungeon and tries to chain himself up since it is full moon and he will be turned into a werewolf.
They drive the werewolf away from Matt but they run into Tyler who slows them down and gives Mason the opportunity to attack Caroline.
On their way to the car to get back home, Damon gives Elena a book he found at Isobel's office with the title "Petrova", telling that it is Katherine's real name.
Stefan tells her that he will make sure to give Matt vervain jewellery to protect him and also to drink so she will not be able to bite him again.
"Overall, "Bad Moon Rising" was an action-packed episode that shed light on the Lockwoods and werewolves in general.
"The "revelation" may not be surprising to the audience, but it's a relief that it is finally out there; hopefully this plotline will move forward a bit quicker now.
Now it’s time for them to keep the flame alive, which they should be able to do, given that they have a talented cast, great writers and an interested audience.