The 100th episode of a TV show is a big deal, and often warrants an especially entertaining episode filled with familiar faces and themes from the show’s past. Pretty Little Liars will reach the 100th episode mark with Season 5, Episode 5, and the PLL Powers That Be are pulling out all of the stops to mark the grand occasion — including the much-awaited return of some of our favorite characters  like Jenna (Tammin Sursok)!

“Oh what's this?! Oh ya know... Just the 100th episode and #Jenna's return #PLL,” Tammin tweeted, along with a photo of the script in question. We can see from the cover that the episode will be called “Miss Me x 100” — a fitting title for Jenna’s return, as well as the potential return of many other characters.

Jenna was last seen in Season 4, Episode 9 (“Into the Deep”), which saw her barely surviving an almost-drowning at Emily’s surprise birthday party after Spencer and Aria overheard her saying she thought Ali was alive. Was alive involved with the attempted murder? Shana claimed that CeCe Drake was the person Jenna feared. Was she the one who tried to kill her? Hopefully, Jenna’s return in the 100th episode will give us some answers about that night.

Also set to return in the 100th episode: Caleb (Tyler Blackburn)! The former PLLer will be relocating to Rosewood after his stint in Ravenswood, and will get to meet the infamous Ali for the first time. Word on the street is that the two will share “chemistry,” and maybe a kiss. Will that go down in the 100th episode?

Are you glad to see Jenna return? How do you think she will react to possibly seeing Ali again? Share your theories in the comments below!

Catch the next episode of Pretty Little Liars on June 10, 2014 at 8 p.m. ET on ABC.

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