Byron Montgomery
— portrayed by Chad Lowe

Aria's dad is the kind of professor every college girl dreams about – handsome, smart, and sexy in a professorial way. He's also the picture of the perfect family man. Unfortunately, his affair with a student doesn't quite fit the image he tries so hard to maintain. What would happen if people found out he's not quite who he says he is? It's already put a strain on his relationship with Aria. Can father and daughter ever reconcile? Or will his secrets ultimately tear his family apart?

Ella Montgomery
— portrayed by Holly Marie Combs

Smart, beautiful and thoughtful, Ella Montgomery prides herself on respecting her children and trusting her family. She has a great relationship with her kids, and she and Aria are friends as well as mother and daughter. Still, there are things Ella doesn't know about her family and it makes one wonder how she'll feel if those secrets ever come to light.

Mike Montgomery
— portrayed by Cody Christian

Aria's Younger Brother

Tom Marin
— portrayed by Roark Critchlow

Hanna's father.

Ashley Marin
— portrayed by Laura Leighton

Hanna's mom Ashley works hard at everything she does – from being a single working mom to keeping up appearances. Her husband left her and Hanna with nothing. The good news is that it created an impenetrable bond between mother and daughter. Ashley would do anything for Hanna – and she'll do whatever it takes to right any wrong her daughter commits. According to Ashley, there isn't any room for mistakes in Rosewood. But can she protect Hanna from what's about to come?

Peter Hastings
— portrayed by Nolan North

Spencer's father.

Veronica Hastings
— portrayed by Lesley Fera

Spencer's mother.

Melissa Hastings
— portrayed by Torrey Devitto

Spencer's older sister Melissa has everything she ever wanted. She just got accepted to the Wharton School of Business and she's engaged to the cutest med student on Earth. What she doesn't already have, she's not afraid to take – like Spencer's newly renovated loft. What would Melissa do if Spencer took something of hers -- namely her perfect fiancé? After all, Spencer already kissed one of Melissa's exes. What's to say she won't do it again – and more? Melissa and Spencer have a definite sibling rivalry. Question is how dirty will it get?

Lt. Colonel Fields
— portrayed by Eric Steinberg

Emily's father.

Pam Fields
— portrayed by Nia Peeples

A loving and ever supportive mother, Pam Fields runs a conservative and orderly household. She always makes time out of her busy schedule to be there for her daughter Emily. But as close as the two maybe, Emily chooses to keep some of her personal struggles in the dark from her. Will these issues bring the two together? Or ultimately drive them apart?

Jason DiLaurentis
— portrayed by Parker Bagley

Alison's brother.

Ezra Fitz
— portrayed by Ian Harding

Rosewood High's new English teacher is every girl's fantasy. He's cute, young – and totally off-limits. Ezra knows better than to get involved with one of his students but the heart wants what it wants. Question is does Ezra have the strength to keep his desires in check? On the outside he's the picture of the very proper teacher – but on the inside there lies a passion that could be his downfall.

Maya St. Germain
— portrayed by Bianca Lawson

Maya's the new girl in town. She's outgoing, bold, funny and rebellious. If that isn't enough to get her noticed in Rosewood, she's also living in Alison's former house. She connects with Emily right away, and from the very beginning the girls have a chemistry that goes beyond mere friendship. How far they will take it remains to be seen. In the meantime, Maya's someone Emily can confide in, but is Maya someone Emily can trust with her darkest secrets? And what secrets is Maya hiding?

Wren Kim
— portrayed by Julian Morris

In Wren, Melissa's found the perfect man. But this gorgeous med student has some secrets he keeps from his future bride. Least of which are the cigarettes he sneaks when she's not looking. There's also the attraction between him and Spencer, which he's not trying too hard to fight. Makes you wonder if Melissa's got her Mr. Right all wrong.

Jenna Marshall
— portrayed by Tammin Sursok

Gorgeous, chic and completely inscrutable, Jenna Marshall lost her sight and gained notoriety. Wherever she goes people stare and whisper. And just the sight of her is enough to chill Aria, Hanna, Emily and Spencer to the bone. What is it about Jenna that unsettles them so? And what secrets does she hold?

Mona Vanderwall
— portrayed by Janel Parrish

Years ago, Mona was desperate to be in Alison's group of friends, but to them she was just a dork to be avoided at all costs. Times have changed since Alison's been gone. Big time. Now Mona is one of the popular kids at school and her BFF is none other than Hanna Marin. But can a person change that much? And when Hanna begins to reconnect with her old friends, what does that mean for Mona?

Alex Santiago
— portrayed by Diego Boneta

Spencer's new love interest, who works at her family's country club. Spencer asks Alex to homecoming but ignores him most of the night, and Alex leaves early after Melissa tells him that Spencer only invited him to anger their father.

Darren Wilden
— portrayed by Bryce Johnson

Detective investigating Ali's murder, who continually questions the girls and takes advantage of Hanna's mother.

Lucas Gottesman
— portrayed by Brendan Robinson

A social outcast who begins to form a friendship with Hanna, for whom he secretly has feelings.

Sean Ackard
— portrayed by Chuck Hittinger

Sean was originally Hanna's crush before Alison disappeared, and they began dating sometime after her disappearance. Hanna's anger and embarrassment at Sean's refusal to have sex drives her to steal his car and ultimately crash it. Sean forgives Hanna and reveals that he is a member of the virginity club RLW, "Real Love Waits."

Noel Kahn
— portrayed by Brant Daugherty

One of Sean's friends and Aria's crush before Ezra. After Ezra leaves Aria, Noel steps in to comfort her. Hanna and Sean decide to go on a double date with Noel and Aria, where Noel tells her that he has feelings for her and that he will keep his options open. Finally, he asks Aria out on a date, and she accepts.

Toby Cavanaugh
— portrayed by Keegan Allen

Jenna's stepbrother. Ali's prank was meant for him, but ended up hurting Jenna; he knows the girls were behind it, but took the blame when Ali threatened to reveal that he was having sexual relations with Jenna. He is interested in Emily and attempts to get closer to her, saving her from near-rape by her boyfriend Ben. When Toby transfers into Emily's chemistry class so he can be close to her, her friends come to think of him as a "creepy stalker." In the August 10, 2010 summer finale episode "Keep Your Friends Close", Toby is arrested for Alison's murder.

Ian Thomas
— portrayed by Ryan Merriman

Melissa Hastings's former boyfriend, who had kissed Spencer. Later in the season, it is revealed that he is romantically linked to Alison DiLaurentis.

Meredith Sorenson
— portrayed by Amanda Schull

Ben Coogan
— portrayed by Steven Krueger

Emily dates Ben at the beginning of the season, but begins to avoid him as she develops feelings for Maya. Emily quickly ends the relationship after Ben attempts to rape her.