Tammin Sursok, who portrays the character of Jenna Marshall in Pretty Little Liars, speaks of the threat posed against the Liars and how its far from over as "A" is still alive and will be back on the 100th episode of the show airing on Tuesday.

Talking to The Daily Edition recently, Tammin admitted that Season Five of the teen drama mystery thriller series on ABC will be the wildest ever. Season 5 starts with Shana pretending to be "A" in the first episode, christened "Escape from New York." Fan may remember that Aria accidentally killed Shana in the previous season. Nevertheless, the Australian-origin actress told The Daily Edition that as the Liars started thinking that their problems are over, they will soon come to know that Shana is not real, but actually a fake.

Tammin also indicated that a character in the drama has a twin sister. A "twin theory" was making the rounds for quite some time, and now Tammin has confirmed it. Fans are beginning to believe that Jason DiLaurentis, who portrays the character of the older half-brother of Alison DiLaurentis, Spencer Hastings, and the younger half sibling of Melissa Hastings, has a twin. A love child of Mrs. DiLaurentis and Mr. Hastings, Jason has a fraternal twin sister.

Tammin's revelations have given rise to the belief that the woman in the 'black veil,' who attended the funeral of Detective Wilden, is actually Jason's twin sister. Even Marlene King, the creator of the show, has corroborated that this character will be the main antagonist in Pretty Little Liars Season 5. She is also reported to have alliances with the "A team," and rumor has it that she is the one who killed Mrs. DiLaurentis in Season 4 finale - "A is for Answers."

In the meantime, while "Pretty Little Liars' Ravenswood" will end the series, it will have crossover episodes with the mother series. TVLine reports that the producers are working on an episode focused on Ravenswood, which will be aired in Pretty Little Liars Season 5. The details regarding the crossover episode are yet to be revealed.

Pretty Little Liars airs every Tuesday at 8 p.m. ET on ABC Family.