Riley and Maya are anxious to begin eighth grade and have a new teacher, that isn't Riley's father. Meanwhile, Mrs. Svorski asks Topanga to take over at the bakery.
Riley and Lucas's classmates are curious as to what's going on with their relationship, which ultimately confuses them more than ever before.
A new student from Texas turns out to be an old friend of Lucas. But, the Lucas of the past isn't the Lucas who the friends have come to love.
Cory, Topanga, Shawn, Riley and Maya travel to Philadelphia to dig up a time capsule that Cory, Topanga and Shawn buried 15 years ago which prompts the kids decide to create and bury one of their own.
When Riley and Maya get into a fight, Cory enlists the help of his brother, Eric, to be a mediator.
Riley tells a lie so she and Maya can attend a party and must deal with the guilt of sneaking around her parents.
When the entire class gets detention, the class divides and chaos ensues. Meanwhile, Auggie's friend Ava attempts to be nicer when she thinks she's losing him to another girl.
Someone from Shawn's past comes back into his life and the situation threatens his relationship with Maya.
Uncle Eric is recruited to run for the Senate, but learns it was only because they expected him to lose. Riley and her friends rally together to help his campaign.
Cory defends a new teacher who comes under fire from the principal for using non-traditional ways of learning to engage students.
Riley is supposed to take the class fish home for the weekend, but it dies as soon as she gets it. Auggie suspects foul play.
The kids aren't satisfied with what they've been voted "Most Likely" for in the school yearbook, and take matters into their own hands to change it.
Riley is asked to the semi-formal dance by a classmate named Charlie and is torn whether to go with him or Lucas. Meanwhile, Cory's brother Eric is paid a visit from an old friend.
When art and music are threatened to be cut from school, the kids have to find a creative way to convince the school board to show their value.
Riley, Maya and Lucas emphasize the beauty of being unique as they rally around their friend Farkle Minkus, who may be on the autism spectrum and is tested for Asperger's syndrome.
Riley realizes that her parents are positively impacting the world and she wonders how she's contributing.
After Maya hurts Riley's feelings, the group learns that Riley is overly sensitive because another classmate is making fun of her. Riley's friends encourage her to like herself for who she is.
Riley and Maya meet the Ghost of the Bay Window, a flapper girl from the 1920s, who makes people sing and dance.
Riley really wants to be a cheerleader; when the tryouts begin, she's determined to make the squad.
Lucas is entered into a bull-riding contest in his hometown; Riley, Maya and Farkle head to Texas with him to cheer him on.
Lucas, Riley and Maya try and figure out their feelings while they're all in Texas together.
Maya, Lucas and Riley try to move on after what happened in Texas.
When the class receives an assignment about forgiveness, Maya writes to her father in an attempt to forgive him for leaving and Riley tries to let go of the fact that Auggie destroyed something important to her.
Cory asks the kids to challenge one another's beliefs to see if it changes their perspectives.
Farkle tells Riley that she has until midnight on New Year's Eve to tell everyone how she really feels about Lucas.
Riley is upset when the boys at school won't let her participate in a science experiment and attempts to become more involved.
When Farkle's dad makes a bad investment, Farkle becomes worried about what that might mean for his family.
Maya and Farkle are caught cheating on a test and have to face the school honor board, which includes Riley and Lucas as members. Meanwhile, Auggie tries to figure out what he wants to be when he grows up.
Riley decides to redecorate the bay window; Maya is offended and hurt that Riley would violate their sacred space.
With middle school graduation around the corner, Riley, Maya, Lucas and Farkle work together to determine what kind of legacy they want to leave at John Quincy Adams.