Casey feels less than welcome at Clayton. Sam asks Paige to spell out the rules of their "casual relationship," while Doug sets boundaries with Elsa.

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.

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 tells Izzie what Nate did. Sam tries to figure out which colleges to apply to. Doug discovers a need to educate first responders about autism.

Sam makes a bold move amid the buzz of orientation day. Casey crosses paths with Nate. Elsa and Doug unpack the hazards of half-truths.