Ali’s first day back at Rosewood High School is destined to be a doozy with Mona’s Army out to make her life miserable. And this former Queen Bee is going to realize that her spot atop the social hierarchy is no longer vacant. But Ali isn’t the only one struggling to adjust to her new reality in Pretty Little Liars’ 100th episode; the Liars are also trying to cope with the changes.

The synopsis for Season 5, Episode 5 (“Miss Me x 100”) — aka Pretty Little Liars’ 100th episode! — reveals that Ali is “determined to put on a brave face” upon her return to the halls of Rosewood High. And even though she’s trying to repair the “damage she did years ago,” her apologies aren’t enough for those she hurt in the past. Expect yet another heated confrontation between Ali and Mona. Frankly, we’re a little afraid of Mona and what she’s capable of.

The 100th episode also features Caleb’s return to Rosewood. After a haunted few months in Ravenswood, Caleb comes back a changed man — new ‘do, new facial hair, new wardrobe, and a new ‘tude. So don’t expect him and Hanna to be rekindling their relationship just yet. She might have her hands full when “an old foe” also returns to town. We’re guessing that “old foe” is Jenna — and seeing how Aria killed her girlfriend Shana, we wouldn’t be surprised if she was scheming something.

Catch the 100th episode of Pretty Little Liars on Tuesday, July 8th at 8 p.m. ET. And don’t forget to check back next week for some juicy 100th episode scoop!

Crystal Bell is an editor at Wetpaint Entertainment and our resident fangirl for all things Pretty Little Liars. Follow her on Twitter and Google+!