It’s hard to believe, but Pretty Little Liars is only a handful of episodes away from its 100th installment. Sure, we have to wait an entire hiatus, but Season 5, Episode 5 is the big 1-0-0, and executive producer Marlene King has something big in the works.

"We're planning that episode right now, and I'm going to write the script," Marlene told The Hollywood Reporter. "We hope that it's emotionally epic for us. There will be a big reveal: One of our mysteries that we've had for a long time on the show will be revealed in the 100th."

We cannot wait. Television series’ 100th episodes are not only exciting for the important milestone they mark in the industry, but for the ways in which the shows generally celebrate the landmark on screen by rewarding the loyal fans with some big moments. But what is this “big reveal”? It’s hard to speculate, not know what will be revealed in tonight’s epic Season 4 finale, but we have a few theories:


  • Who killed Ian?

  • What happened to Toby’s mother?

  • Does Alison have a twin?

  • Is Maya really dead?

  • What is Melissa hiding?


Whatever it is, it sounds like it’s a mystery that’s been around since the beginning. There actually aren’t so many of those left (besides the obvious: who is “A”?). We’re dying to know what it might be.

What question do you think will be explored in the 100th episode of Pretty Little Liars? Are you as excited as we are that the show has made it this far? Sound off in the comments below!

Catch the next episode of Pretty Little Liars on Tuesday, March 18, 2014 at 8 p.m. ET on ABC Family.

Kayti Burt is a contributing writer for Wetpaint Entertainment with a penchant for all things pop culture. Follow her on Twitter and Google+!