Tonight is the much awaited 100th episode of Pretty Little Liars and fans should watch out for Ezra and Aria, according to show's creator Marlene King.

The centennial episode of "The Pretty Little Liars" is a big event for fans as it includes the return of some of the characters.

The official synopsis of Pretty Little Liars season 5, episode 5 states: "The day has finally arrived - Alison's first day back at Rosewood High, and neither of the PLLs nor Alison are really ready for it. Determined to put on a brave face, Alison returns to also help heal the damage she did years ago. But are apologies enough for those who Alison has hurt in the past? Not if Mona and her army have anything to say about it. Meanwhile, Caleb and an old foe return to Rosewood."

Apart from Ali's most-anticipated return in Rosewood, other faces will also be returning to Rosewood to stir up the 100th episode. According to show creator Marlene King, there are some new faces that were actually old faces. Fans speculated that characters lurking at the back that the audience pays little attention to before.

Meanwhile, Marlene King also spilled some spoilers for the upcoming episode, according to E! Online. She said that fans should watch out for Ezra and Aria as "something magical might happen" between the couple in the big episode. The report said that Marlene King gestured towards the bed.

Moreover, fans should expect for #KeyLimePie to trend worldwide today. This is a little bit cryptic and King only stated, "Key lime pie, I will say that. That's a big spoiler, key lime pie!"

Fans can watch the episode 5 of "Pretty Little Liars" season 5 online on ABC. Moreover, catch the 7-minute teaser of the 100th episode here.

Pretty Little Liars' 100th episode airs Tuesday, July 8, at 8 p.m. on ABC Family.