The teachers are back for development week, a time to prepare for the upcoming year. Janine is determined to start the year off right and leave her problems at home. Ava runs a side hustle out of the school parking lot.

After Janine gets a look at the new charter school down the street, she becomes determined to fix up Abbott and make it just as good. As Gregory goes out of his way to avoid Barbara due to an awkward situation with his personal life, and Ava takes to the school library to host a “Shark Tank”-style pitch to decide what to do with the rest of the funds from the grant.

After Gregory sends a disruptive student to the principal’s office, he’s dismayed to find out the kids actually enjoy spending the supposed disciplinary time with Ava. Meanwhile, Melissa invites Janine over to her house to teach her how to cook, but Janine becomes determined to reunite Melissa with her estranged sister

Janine is thrilled to help introduce a new beverage to the cafeteria, but it ends up causing unexpected consequences for the students, teachers and school plumbing system. Elsewhere, Melissa clashes with her new aide, Ashley, who brings more disruption than help to the classroom.

It’s Halloween at Abbott Elementary! When a student steals a bag of candy meant to be given out to the kids at the end of the day and starts distributing it during school hours, the teachers band together to find the culprit. Meanwhile, Janine is invited to a Halloween party by an old friend and starts to reconsider her personal life.

The teachers are appalled after seeing a commercial in support of charter schools criticizing Abbott Elementary. When students begin to transfer schools, Jacob, Ava and Melissa invite the leader of the charter school organization to Abbott and ask him to take down the ad. Elsewhere, Janine and Gregory talk about Janine’s relationship with Tariq .

When the eighth-grade science class participates in an egg drop activity, Janine insists her second-grade class joins in. Even when the science teacher and Gregory tell her that her students aren’t ready for physics lessons, Janine is determined to prove them wrong. Then, when Barbara is shocked at the clothing one of her student’s parents wears, she learns to not judge someone solely based on their appearance.

Janine is out sick for the day; but with the substitute teacher shortage, Ava grows desperate and must step in herself to help out. She starts the day in an unconventional fashion, disrupting the students’ typical routine as well as neighboring classrooms. Meanwhile, Barbara and Melissa revel in the quieter-than-normal teacher’s lounge.

On the last day of school before winter break, Janine is convinced by her friend to go to a popular hookah club where she runs into unexpected colleagues. Elsewhere, Jacob crashes Barbara and Melissa's traditional holiday dinner and in the process begins to learn the true meaning of Christmas.

The competition heats up between Melissa and Janine as their classrooms go head-to-head in a read-a-thon sponsored by a local pizza shop. Both teachers encourage their students to hit the books hard but face some unexpected obstacles on their path to pizza glory. Meanwhile, Jacob and Gregory join forces and attempt to get their student-podcasting club off the ground.

During a day of touchdowns and missed plays, the Abbott Elementary faculty find themselves learning lessons in teamwork. Two of Janine’s students aren’t getting along in class, leading her to seek advice from her colleagues on how to help repair their friendship. Meanwhile, Melissa and Ava plot to bring down Mr. Johnson in fantasy football.

Barbara organizes a candy-selling fundraiser to raise money for a school field trip to the science museum. When sales don’t go as planned, Ava steps in to teach the students new, unconventional selling tactics. Elsewhere, Mr. Johnson and Jacob butt heads about how to take care of a cat found in the janitor’s closet.

On Valentine’s Day, the Abbott teachers discuss their relationships and plans for the holiday. Janine finds out one of her students has a crush on her and when turning to a colleague for advice, she inadvertently learns a secret about another teacher. Elsewhere, Ava sits in on Jacob’s Black History class after receiving a complaint

Barbara’s candle accidentally starts a small fire in the teacher’s lounge and a counselor suggests that she might not be handling the aftermath well. Meanwhile, Melissa rekindles her childhood dream of being a firefighter.

The Abbott staff heads to the Pennsylvania Educational Conference. Gregory reluctantly attends after a disagreement with Amber and bonds with Janine over their similarities. Jacob finds himself charmed by the Addington teachers.

Jacob secures a visit from a mural arts program for his students but doesn’t agree with their chosen design and attempts to influence their decision. Barbara and Melissa learn parents are petitioning to turn Abbott into a Legendary charter school.

It’s Teacher Appreciation Day. When the district gives Abbott two courtside tickets to a 76ers game, the teachers must decide who deserves them. Later, Janine invites the teachers to her house for game night and her sister, Ayesha, comes to visit.

Abbott Elementary rallies together to fight the threat from Legendary Charter Schools. Ava pitches a festival to draw parents to school and collect their signatures for a petition. However, Draemond shows up with the intention of derailing the event.

Gregory is named Educator of the Year. Later, Janine deals with a difficult student, and it's revealed that Barbara hasn't completed her teaching requirements.

Janine's plan for a Memorial Day weekend solo trip is derailed when her mother shows up unannounced asking for help; Gregory notices his colleagues are great at small talk and realizes he needs to brush up on his people skills.

Abbott Elementary takes a field trip to the Franklin Institute; Gregory is eager to spend time with a reluctant Janine; Ava teaches the students about aliens, which leads to chaos.