Pretty Little Liars Season 3 Summer Finale Canadian Preview: Mona’s Back! (VIDEO)

In this spoiler-ific Canadian preview for the Pretty Little Liars Season 3 summer finale (Season 3, Episode 12: "The Lady Killer"), there's so much going on that it’s hard to know which element of surprise to focus on first. We get to see Mona’s (Janel Parrish) final shocker (shades of Kill Bill for Tarantino fans), a quick shot of a terrifying explosion, and we even hear "A"’s supremely scary voice — sort of. Check it out below!


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