Cruel yearbook comments show Sam who's got his back, a favor he repays at graduation. Feelings for Izzie confuse Casey. Elsa asks Doug a key question.

Sam deals with a big disappointment, Casey clashes with Elsa over college plans, and a recurring dream vexes Doug.

A rogue plan for Zahid leads to a last-minute mission for Sam, Casey, Paige and Abby. Meanwhile, Doug faces a major test and makes a pivotal choice.

After a disastrous dinner with Paige's family, Sam makes amends at the school dance. Casey's fury at her mom affects her relationship with Evan.

Sam’s art assignment inspires an impromptu field trip. Casey navigates a fight with Izzie. Evan works hard for a second chance with Doug.

A hard truth keeps Casey up at night. Sam experiences a rough season with Zahid -- and Paige. Elsa and Doug brace for their next chapter.

As Sam gets political with his art, Elsa and Doug explore a (not-so-normal) weekend away. Casey and Izzie re-examine their relationship.

Ignoring Casey's wishes, Elsa throws her a big birthday party, while Sam insists on following a decade-old birthday ritual. The bartender haunts Doug.

As Paige makes a plan in the face of adversity, Sam awaits a crucial academic update. Elsa endures an uncomfortable encounter.

As Casey reaches a crossroads, she finds herself questioning a lot of things. But in the meantime, she helps Sam get over a hurdle of his own.

To prepare for college life, Sam sleeps over at Zahid's. Sam's $700 loss reunites Doug and Elsa with Arlo's parents, former friends of theirs.

Casey's demanding schedule starts affecting her grades, while Sam seeks out some extra credit himself. A chance run-in revives old suspicions for Elsa.

As Sam gets ready for an adventure, Elsa thinks about ways to discourage him. Casey gets an up-close look at Izzie's tense home life.

Casey and Izzie face fallout from the protest. Paige tries to prove her mettle to Casey through strange tasks. Doug avoids dealing with a painful loss.

Elsa makes a meaningful reconnection. Paige plans a romantic night with Sam. Pressure mounts on Casey ahead of a big track meet.

When Sam learns his crush is already taken, dad Doug helps him woo her. A lost credit card sends Elsa back to the bar. Casey hears rumors about Evan.

A change at work leaves Sam scrambling for cash. When Izzie fights the school dress code, Casey feels conflicted. Paige discovers a knack for management.

In peer group, Sam realizes he needs to manage his own money. Doug gets advice from Megan on dealing with Elsa. Evan meets Casey's new friends.

Sam decides to update his look. Casey learns a family secret. Feeling like her family no longer needs her, Elsa seeks attention elsewhere.

Sam's living situation with Zahid gets off to a rocky start, while Elsa struggles with her son's departure. Casey weighs telling Doug about Izzie.

Sam seeks a worthy caretaker for Edison. Casey tries to be supportive of Izzie, but her plan backfires. Zahid shares tough news with Sam.

Paige invites Sam to redefine their romance, Casey struggles with complicated feelings, and Elsa attempts to find a new normal with Doug.