"You just can't be ready for it."

Gulp.

That's what Pretty Little Liars boss Marlene King tweeted about Tuesday's epic season five finale, "Welcome to the Dollhouse," which will finally reveal the ABC Family hit's biggest mystery: who the heck is "Big A"?!

And while you probably won't every be fully ready for it, you can prepare yourself as much as possible, and we're here to help. We recruited Marlene King to pick the five episodes PLL fans should rewatch, pause and rewind to look for clues during right now, the ones that are the most essential to check out before watching the finale.