An interview with a former St. Bernardine student gives the guys confidence that they’re on the right track with their most recent theory.

A student’s sudden lack of cooperation slows the investigation, but an incident in the school parking lot sends Peter and Sam down a new path.

As Peter learns more about basketball star DeMarcus Tillman, he uncovers evidence of athletes getting preferential treatment at St. Bernardine.

Sophomore year is off to a good start for the girls until Katie twists her ankle. That gives Alexa something else to focus on while waiting to hear from her…

When Katie needs help prepping for a math midterm, Alexa offers to ask Dylan. Meanwhile, Jennifer still doesn’t know her daughter has a job.

After landing the lead in the school play, Katie’s left wondering whether she actually earned it. Jennifer asks Lucas to baby-sit.

To kiss or not to kiss? Katie’s new life as a thespian has Alexa feeling a little left out. Jennifer accuses Lori of stealing her thunder.

Dave can’t wait to show Lucas his alma mater. And with her family away for the weekend, Alexa’s ready to break all the rules.

Lucas longs for “bro time” now that Dylan and Alexa are hanging out. Dave’s nose detects a cat … and he’s not wrong.

Alexa’s first high school dance is right around the corner. But a risky flu outbreak means she might not be able to go.

Axl feels embarrassed when he and Sue are asked to work on a school project together; Brick’s school therapist (Dave Foley) tries to help him make friends.

Riley is surprised when she gets invited to a party that doesn’t include Maya. However, once she arrives, she soon learns it’s a party filled with unpopular classmates.

When Smackle, a debate champion from another school who happens to have a crush on Farkle, realizes that he only sees her as an academic rival, she enlists Maya and…

When Smackle, a debate champion from another school who happens to have a crush on Farkle, realizes that he only sees her as an academic rival, she enlists Maya and…

Riley is surprised when she gets invited to a party that doesn’t include Maya. However, once she arrives, she soon learns it’s a party filled with unpopular classmates.

The CSIs investigate a crime that has ties to a 25-year-old mob heist; Brass is faced with a decision when his daughter tries to commit suicide.