“Pretty Little Liars” hits a huge milestone Tuesday, July 8. The fifth episode of Season 5 will mark the 100th episode of the hit ABC Family series.

After four seasons, Alison is finally back in Rosewood and “A” is supposedly dead. But as fans of the show know, that doesn’t mean that the Liars are free and clear. With lies piling up and new enemies around every corner, the drama in Season 5 has only just begun.

The 100th episode, “Miss Me x 100,” will feature Alison’s big return to Rosewood High School. After doing some digging online, the former Queen B is well aware of a majority of the school’s dislike for her. She’s ready to “help heal the damage she did years ago,” however that won’t be easy with Mona’s new anti-Alison army.

ABC Family released two sneak peek videos from the fifth episode. Watch the clips from the 100th episode below:

Sneak Peek 1

The first sneak peek video features Spencer and Toby -- and things are pretty tense between them since his return from London.

“Do you want me to talk to your dad?” he asks an upset looking Spencer. But the teen knows that even Toby can’t help.

“Good luck finding him,” she tells her boyfriend. “He’s avoiding me like the plague.”

“Pretty Little Liars” fans will remember that Spencer’s relationship with her father has been strained since the end of Season 4. Her parents have been keeping secrets from her -- the latest possibly involving the death of Alison’s mom, Jessica DiLaurentis. In episode 4 the cause of Jessica’s death was revealed to be from someone switching her low blood pressure pills with high blood pressure pills. Spencer was initially relieved -- until she discovered her father’s prescription for high blood pressure pills.

“Does Alison know?” Toby asks Spencer. “What you think he did to her mom?”

Despite Alison’s supposed change in attitude, Spencer knows better than to “arm” Alison with information before she can prove his involvement.

“She seems really genuine when she says that what she’s been through changed her,” Spencer says of Alison. But Toby catches on that Spencer still doesn’t trust her friend. Even though he acknowledges that the pair have both received second chances over the years, he tells her that sometimes its best to close the door on a “toxic” relationship. Before he can continue about cutting Alison loose, Toby gets a call from someone else from whom they previously cut themselves off -- his stepsister, Jenna.

Toby reveals he hasn’t spoke to Jenna since she moved to New York -- a piece of information about which Spencer had no idea. When Toby answers the call, Jenna tells him Shana is dead and he promises to go right over.

“She could hardly get out the words but Jenna said that she was murdered,” Toby tells Spencer.

Sneak Peek 2

The second sneak peek video from the 100th episode features Hanna’s new boyfriend Travis, who has been missing-in-action since Season 4. The two are working on a school project about Mars, however, Hanna is having a hard time concentrating on the work.

“Hanna, there’s no rule that says you have to walk into school with her tomorrow,” Travis says, referring to Alison’s first day back at Rosewood High School.

“Well it’s not written down, but it’s understood,” she explains to her boyfriend. “We’re going to walk down those hallways with Ali and everyone will think what they always thought: that we’re her puppets.”

Travis does his best to tell Hanna she’s her own person now and to not care what others think, but Hanna’s having a serious identity crisis.

The 100th episode of "Pretty Little Liars" will air on ABC Family on Tuesday, July 8, at 8 p.m. EDT.