In the series finale, the Kappa Taus try to stop the demolition of their house. Meanwhile, Cappie and Casey come to a realization about their on-again, off-again romance; and Cappie and Evan determine whether their friendship is meant to last.

Beaver goes to class to find he got an F on his paper because it‘s plagiarized. He‘s needs to write a decent, original paper by the next morning or the F stays on his record. Casey talks with Katherine in hopes of forming a study group with her, but Katherine says she doesn‘t like study groups. Beaver meets Katherine, and is instantly smitten. Rusty and Dana are working on a science project together, and Ashleigh joins in to help make their slideshow more presentable. Dana requests to be called a co-inventor on the credits page, but when Rusty finds out, his anger ruins the presentation. The committee likes the invention, but pulls Rusty from the project and gives it to a professional team. Rebecca invites Cappie to the pledge party so she can make Evan jealous. Casey and Beaver team up in search of case summaries for Casey. Beaver accidentally invites Katherine along as they search for notes, much to Casey‘s dismay.

Rusty is planning Calvin‘s 21st birthday party at his apartment. Casey and Ashleigh have not been speaking and are afraid to run into each other at the party. A really bad snowstorm hits Cyprus Rhodes shutting down all roads. Since Heath is not able to make it back with the alcohol, the gang of eight decides to walk to Dobbler‘s. Inside Dobbler‘s, the group decides to play the game "Kiss & Tell" where secrets and feelings are revealed.

Casey and Cappie wake up together and Casey kicks him out of the house before anyone finds out, claiming that nothing can happen between them. Rusty wakes up from the party completely hungover, and unable to remember what happened. He finds red lipstick on his mouth, and sets out on a search with Calvin to find the mystery girl. Casey and Cappie meet up later and realize that they did not use protection the night before. Casey gets the morning after pill just in case. At ZBZ, the sisters are watching over faculty children during the big game, and Cappie comes over to help Casey, and to prove to her that he‘s matured. Rusty also divulges to Casey that Cappie declared a major. Later that night, Casey and Cappie share a romantic moment in the playground. Meanwhile, Professor Segal (Josh Randall) flirts with Ashleigh, who is still distraught about her undetermined future

The season opens with Casey, Evan, & Ashleigh’s graduation day. Casey and Cappie haven’t spoken since Spring Break and are anticipating saying their final goodbyes to each other, which does not go as smoothly as expected. We then skip to the end of summer and Casey packing up to move to Washington DC for law school. Through some prompting from Evan, Casey learns that the reason she did not get into CRU law school was a result of a bad recommendation from Joel (Sam Page). After Casey confronts Sam, he reconsiders and has his letter rescinded. Casey is accepted into CRU law and decides to stay after all. Ashleigh has moved to New York for an internship that is not exactly what she was hoping for. Evan is attending CRU law school with Casey.

Lasker Parkes (Jonathan Silverman), Peter‘s dad, comes to visit Kappa Tau, and Cappie feels pressure to impress the him. Cappie plans an Everest party for Homecoming, complete with ice luges throughout the house. Lasker wants to know who is Peter‘s big brother in the. Rusty wants to be Peter‘s big brother, but Peter wants Cappie. Meanwhile, Casey tries to convince Ashleigh to find a job and move out, but Ashleigh keeps dragging her feet. Casey and Evan go to an alumni dinner because their law professor will be there. Casey gets into a fight with Ashleigh. To impress Peter, Rusty plans to steal the A&M goat mascot at night, but while they‘re in the process, Dale and some Omega Chi members interrupt with the same plan.

Kappa Tau faces academic probation when one of their pledges mysteriously receives straight F‘s, the KT‘s suspect Omega Chi and Dale are behind it. Rebecca uses the investigation as her post Evan break up coping mechanism and discovers that Omega Chi is actually playing a trick on Dale. Evan takes revenge on Casey for his break up with Rebecca by attempting to make her look less than capable in her Law school studies.

ZBZ becomes a finalist for the best chapter in the nation and Rebecca takes charge with an iron first, she even goes so far as to invite Frannie, now employed at CAA, to help them prepare. Casey worries Rebecca is turning into Frannie, who tries to rekindle a friendship with her.

The KT’s decide since they lost several members of their frat last year, it’s time to actually try to recruit pledges. The KTs set up a booth during rush on campus to help with recruiting. Tegan (Charisma Carpenter) shows up to help the ZBZs maintain their newly regained best house on campus title. Tegan and Rebecca argue on how rushing should go and Casey comes to Rebecca’s rescue with a plan to have Dana (Martha MacIsaac) keep Tegan distracted. The ZBZs entertain a potential new pledge Heather, who is Heath’s sister. Dale also entertains the idea of rushing this semester

Rusty, Dale and Dana are hanging out together and Dana suggests throwing a murder mystery dinner party to help Dale socialize. Members of Omega Chi Delta then storm in and take Dale away as he‘s pledged to them. Casey gets a surprise visit one night from Ashleigh, who has lost her job in New York and now plans to stay back at the house. Calvin reveals that he has no major, just like Cappie, but wants to keep it a secret. Meanwhile, Rusty worries that Dale is joining Omega Chi to get back at him, so he devises a plan to get Dale membership into Kappa Tau. But Dale is insulted by Rusty‘s insistence, and goes to Omega Chi‘s hazing anyway. While he‘s there, Rusty and his friends kidnap him and take him to Dana‘s murder mystery party, inadvertently leaving Spidey there to face the Omegas‘ wrath. Dale eventually leaves Rusty‘s party, claiming that he wants to be a part of that fraternity, and that Rusty should care about his own pledge Spidey instead. Casey is having a hard time finding a study group to join in her new law class because of her controversial past. Ashleigh reveals that she actually ran away from her job because she couldn‘t handle it. Katherine (Nora Kirkpatrick) returns to attend CRU Law school.

Casey returns with secret plans to move out of the ZBZ house; a new freshman is highly desired as a pledge; Rusty tries to balance studying with life in the Kappa Tau house.

Troubled by the recent discovery that Andy hooked up with Jordan, Rusty is hesitant to take Andy on as his little brother. Will Rusty be able to get past the budding relationship to become the big brother Cappie has been to him? When Cappie hears of Rusty’s reluctance, he takes Rusty aside to remind him that he brought Andy as a pledge to the fraternity and it is his responsibility to be the best Big Brother that Rusty can be for him. Meanwhile, when Evan’s real-life brother, Patrick, comes for a visit, their celebration at Dobler’s is interrupted by Cappie and the three end up reminiscing about their old camp days. But later Patrick shocks and disappoints Evan by asking for money. Frustrated by his brother’s actions, Evan takes it out on Frannie. When Casey and Rebecca believe that the thief responsible for stealing the ZBZ food supply is Fisher, they can’t figure out why Ashleigh won’t accept it. But when they dig a little further, Ashleigh reveals the delicious truth.

Casey seems to have it all - she's in the best sorority, has the most popular boyfriend, and is in-line to become the next President of her sorority that is until her dorky brother, Rusty, comes to school and is determined to join a fraternity.

It's the first week of school and the first week of rush and neither is going particularly well for Rusty. On his very first night trying to become one with his pledge brothers, he fell asleep on the job. His "brothers" let him know they weren't too happy by leaving Rusty to dash off to class sans shoes, with blue feet and covered in mud. Rusty's professor was not amused.

It's mating season and no one seems to be having a good time. Rusty has to come up with a date for a Kappa Tau party but since just talking to a girl turns him into a blithering idiot, it's going to be hard to convince someone he's appealing. So he turns to Casey for help.

Everyone is asked to suit up and pick sides as Kappa Tau and Omega Chi go head to head in floor hockey. But that’s not as easy as it looks. Casey is rooting for Evan and Omega Chi, naturally. So much so that she sets Cappie up for a fall. But did she do it to help her man or to get back at Rebecca? Because Casey and Rebecca may be “sisters” but they sure don’t play like a team. When Rebecca learns that Casey of “Casey and Evan” was formerly with Cappie, she uses the info to backstab Casey and get herself promoted to ZBZ’s head of Athletic Support. That’s when Casey shows what she’s made of—no one is going to beat her.

Cappie turns to Rusty for his brain power when the volcano for Kappa Tau's legendary Mt. Vesuvius party fails to erupt. Meanwhile, Casey and Evan are back on track as he introduces her to his powerful parents over dinner. But an unexpected appearance by Rebecca, a Senator's daughter, instantly bonds her to Evan's parents, leaving Casey to feel like an outsider with this blue-blood clan.

In Casey's bid to become president of Zeta Beta Zeta, she tries to win over her sorority pledges by throwing a slumber party that turns scary when the lights go out. Meanwhile, the same stormy night at Cyprus Rhodes University brings trouble for Cappie when he gets an unexpected visit from a beautiful and mysterious girl named Destiny.

As mid-term week approaches, the pressure is building for Rusty as he is determined to maintain his grades while keeping up his social life at the fraternity. Of course, Cappie has the answers for him but is it the right thing to do? Cappie not only presents Rusty with an appealing offer of help but when he is partnered with Casey on a school project, Casey is tempted once again by her past.

Couples are coming together. Couples are splitting apart. There’s Casey and Ashleigh—best friends and sorority sisters since freshman year, now they’re on the outs. Lack of support—Casey for Ashleigh—is the issue. But someone’s waiting in the wings to show Ashleigh she can be a friend, and that someone is Rebecca.

Allies become enemies when both Casey and Frannie are nominated for the title of Omega Chi Sweetheart. Who will prevail in this the ultimate cat fight? Meanwhile, as Rusty's relationship with Jen K. heats up, he longs for more private time with her but his judgmental roommate Dale is always around, making it difficult for the two lovebirds to spend time alone.

When a scandalous story in the college newspaper hits stands trashing the Greek system, the brothers and sisters of Omega Chia, Zeta Beta Zeta and even Kappa Tau are in a frenzy to figure out who the undercover culprit could be. Meanwhile, after navigating some troubled waters with her boyfriend, Ashleigh turns to Calvin for support and even goes so far as to hit on him, only to learn he has a secret.

Rusty and Casey return to CRU but must contend with the backlash from Jen K's story, and deal with the fallout from their relationships. Meanwhile, Cappie and Rebecca must make a choice about their relationship.

Hoping to sneak around Dean Bowman's probationary despotism, Casey tries to liven up the Zeta Betas by joining forces with Cappie and his Kappa Tau brothers to plan a Prohibition party with a Great Gatsby theme.

Omega Chi becomes the victim of Kappa Tau's pranks when Cappie seeks to get even with Evan for blowing the whistle on their recent underground festivities. Meanwhile, Casey's rivalry with Rebecca intensifies when she learns about Rebecca's new relationship.