Ugh, Jenna Marshall (Tammin Sursok) is back, and Pretty Little Liars' core four is so not excited. She's the last person they want to see, especially after they just buried a body.

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Janel Parrish tells TVGuide.com that Mona is also stressed about her former foe's return, and describes their reunion as "very, very tense." The big question on everyone's mind? Why is Jenna back... and how long before her inevitable plot for revenge gets set into motion?

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