Jenna Sommers was a vampire and a main character in the first and second season of The Vampire Diaries. Jenna was the maternal aunt of Elena, Alex, and Jeremy Gilbert, and became their legal guardian after their parents (Grayson Gilbert and Miranda Sommers-Gilbert) were killed in a car crash. She's also the younger sister of Miranda Gilbert and the sister-in-law of Grayson Gilbert. During the majority of her time in the series, she remained unaware of the supernatural forces in Mystic Falls until she finally learned the truth near the end of the second season. She used to date Logan Fell, who was turned into a vampire by Anna and was then later killed by the vampire hunter Alaric Saltzman. She then began a relationship with Alaric, who also happened to be Elena and Jeremy's history teacher. She also went to high school with Mason Lockwood, who was Tyler Lockwood's uncle. Before she became Elena, Alex, and Jeremy's guardian, Jenna was a party girl who frequently indulged in alcohol and marijuana, especially back in high school, which Mason revealed when he returned to town for a visit. In Season Two, Katherine Pierce compelled Jenna to spy on Alex and her boyfriend Stefan Salvatore, and when the two didn't heed her warning to break up, she then compelled Jenna to stab herself in the stomach while Alex and Alaric watched as retribution for not taking her seriously. At the hospital, the doctors said that she was lucky to be alive.
Her relationship with Alaric became strained after she discovered that his wife Isobel was still alive, and that he is a vampire hunter. She finally learned the truth about the existence of the supernatural after she was attacked by Niklaus Mikaelson, who was terrorizing Elena, Alex, and their loved ones in preparation for the sacrifice ritual to break his curse. Shortly after reconciling with Alaric, she was called by Katherine, who tricked by pretending to be Elena in order to lure her out of the house so Klaus could kidnap her and turn her into a vampire for his sacrifice. During the sacrifice, Klaus killed Jenna by staking her in the heart in order to break his curse and finally release his bound werewolf aspect and become a true hybrid.
Jenna was a relative of the Gilbert Family.