The KT's attempt to recruit new pledges, Tegan (Charisma Carpenter) returns to help the ZBZ's maintain their top position.

In the finale, the KT's fight to save their house from demolition, and Cappie and Casey make a decision about their relationship.

Cappie tries to impress Peter's dad (Jonathan Silverman), and Calvin discovers Heath's secret.

Rusty wakes up hungover and tries to retrace his steps to discover what he did the night before, which included a kiss with an unlikely person.

A snowstorm finally hits CRU and the gang retreats to Dobbler's, where friendships are mended, a relationship ends, and a surprise second kiss happens.

Casey and Evan continue their feud during a mock trial in Professor Segal's class, making the case personal instead of a simple class assignment; Rusty and Calvin must save Dale from being humiliated by the Omega Chis during the Pledge Talent Show.

Ashleigh and Katherine return to campus, and Rusty must choose between his pledge and helping Dale.

Beaver finds an unlikely love interest in Katherine. Meanwhile, Casey tries to track down some study notes and uncovers a secret about Heath.

When Rebecca finds out that ZBZ is up for the Golden Lily award for being the best chapter in the country, she recruits the help of former house president.

Max decides to take his relationship with Casey to the next level; Jordan and Rusty share an unexpected common bond; a party game leads Rebecca into new territory.

The KT house gets new neighbors; Calvin tries to solve a mystery.

Rusty and Jordan become the final two players in the Gotcha Game; Grant and Calvin go out for a romantic dinner; Casey attempts to reverse Katherine's cancellation of the annual "Undie Run."

Lonely Casey interferes with Rusty and Jordan's budding romance; Calvin gets a new roommate; Evan and Cappie compete for a young woman in the secret society.

Dale and Rusty attempt to uncover a secret society on campus; Rebecca and Robin go on a date.

Rusty and Ashleigh work to ensure a victory in the Homecoming Week float competition; Evan may lose his trust fund following a conversation with his father.

Casey suffers feelings of guilt over the fire; Rusty's popularity soars after he wins the grant competition.

Rusty risks being dropped from the honors program if he cannot raise his grade in organic chemistry; Casey adjusts to single life; Dale faces a moral dilemma.

Rebecca's scandal causes a fight among the ZBZ women; Rusty's efforts to impress Jordan's father lead to painful results; Dale and Cappie explore different religions.

Casey sets up Rusty and Katherine on a date; Natalie tries to ruin Ashleigh's relationship with Pete; Evan hopes a special gift will bring out Rebecca's romantic side.

Rusty and Andy attempt to return a stolen football to the athletic department; Casey sneaks Max into an exclusive faculty party; Rebecca questions her sexual identity.

Casey and Ashleigh go on a double date; tensions rise during a softball tournament.

Eddie Sutton is a dedicated Southern California police officer who lives with his family in a suburban apartment complex. When the department offers him the chance to own the run-down crack house he just raided, Eddie jumps at it . However, wife Jenn and teenage kids Cassie, Tay and Lizzie are less than thrilled. The area is filled with danger, but good neighbors welcome the family to the community.

Brenda Hampton, creator of "7th Heaven" is behind the drama about the ways a teen pregnancy affects the lives of close-knit friends and family members. When Amy finds out she's pregnant after a fling at band camp, she faces a number of challenges. Her decisions have far-reaching effects on her family and friends, but Amy also learns that most teens in her school have issues they must deal with.

Bay Kennish is a teenager who grew up in a wealthy family with two parents and a brother. Fellow teen Daphne Vasquez, who lost her hearing at an early age, was raised by a single mother in a working-class neighborhood. One day in her high-school chemistry class, Bay discovers that her blood type doesn't match either of her parents'. Official tests confirm that Bay is not her parents' birth child. When the Kennish family meets Daphne and her mom, Regina, they realize that the girls were switched at birth. The news prompts the Kennishes to allow Regina -- who is experiencing financial difficulties -- Daphne and Daphne's grandmother to live in their guest house. The two polar-opposite families struggle to learn how to live together for the sake of the girls, who try to keep their footing in both the world they know and the new one into which they are thrown.

Stef, a dedicated police officer, is in a relationship with Lena. The two have built a close-knit family with Stef's biological son, Brandon, and adopted twins, Mariana and Jesus. When Lena meets Callie -- hardened from being in and out of foster homes -- the couple welcome her into their home, thinking it is temporary. Callie's blunt commentary about the atypical family hits a nerve with the twins, who struggle with their own identities. Then the girl discovers a secret that could land Mariana in trouble. Brandon helps Callie navigate the social scene at high school, but she skips school to meet up with an old friend. Her behavior makes Stef and Lena second-guess their decision to help her.

When charismatic Danny Desai returns to his hometown after spending five years in juvenile detention, he sees that things are no longer as he remembered them. His mother's socialite status has plummeted due to his incarceration, and his childhood friends Jo and Lacey have grown apart and are at opposite ends of the social spectrum. Lacey is popular and dating the captain of the soccer team, while Jo struggles to put the trauma of the past behind her. Jo wants to give Danny a second chance, but when she asks for answers about the motive behind his crime, he won't -- or can't -- reveal the information. When a fellow student is found dead in her home, the town spins into a frenzy of suspicion and mystery -- with Danny as prime suspect. Jo and Lacey must decide if their childhood friend is guilty or just a victim being persecuted for his twisted secrets.

Emily Kmetko's dreams of becoming an Olympic gymnast inch closer to reality when she receives a scholarship to The Rock training center in Colorado. But her natural abilities and lower economic status don't immediately make her any friends among the center's elite, who include top gymnast Payson Keeler, beautiful Kaylie Cruz, resident hottie Carter Anderson and ultracompetitive Lauren Tanner, who would like nothing more than to see Emily head back to where she came from. Amidst the backstabbing and bonding, they're teammates in name only, all in pursuit of what every gymnast competes for: a perfect routine.

One of the definitive shows of the 1990s, "90210" originally follows the lives of Brandon and Brenda Walsh, who both eventually leave the show, and their friends through high school and college into adulthood. In addition to making sideburns momentarily cool again during its run, the show deals with a steady stream of love triangles and other romantic entanglements, and occasionally touches on more serious issues as well.

As time has passed since Alison, then the queen bee of the bunch, went missing. Spencer, Aria, Hanna and Emily have gone on with their lives, though they've grown apart. As the years go by, each girl finds herself facing a new set of challenges when anonymous text messages from "A" threaten to expose all their secrets -- both old secrets the girls were sure only Alison knew, and newer secrets developed after Alison's disappearance. Who is "A" and how does he or she know the things he or she knows? Based on the series of novels by Sara Shepard.