As the kids creep closer to adulthood, a memorable finale takes them back to where it all began to say goodbye — and face the future.

A school sleepover turns messy as Nick dishes on a makeout session and the Shame Wizard works his miserable magic on the whole class.

After traveling through a magic portal to puberty headquarters, Nick seeks out a new Hormone Monster and Jessi bonds with the Depression Kitty.

Connie recruits a Compassion Pachyderm to teach the kids how to see things from another point of view. Andrew sets out to steal Missy's man.

When a freak storm gives everyone new superpowers, tensions between Andrew, Nick and friends boil over into an epic showdown.

On a Birch family ski trip, Leah prepares to go all the way with Val, and Andrew hits it off with a fellow ski noob. Matthew helps Jay out of a slump.

A steamy novel making the rounds at school inspires Jessi to explore her own sexuality -- and leaves the boys totally confused about what girls want.

When Leah hosts a party for the high school drama crowd, Nick wrestles with a romantic dilemma, and Andrew and Missy witness a disturbing scene.

A classmate's booming bosom sends the boys into a rapture -- and leaves the girls with a raging case of insecurity. Coach Steve drops a bombshell.

Nick tries to lighten the mood at the sleepover with a new twist on Truth or Dare. The Shame Wizard meets his match. Jessi vows to change her ways.

While Nick tags along with the Gloubermans on a wild road trip to Florida, Jay discovers he's been "Home Alone'd" -- and moves in with a new family.

A sudden outbreak of body-swapping yields awkward situations and poignant revelations galore.

During a sleepover, Jay teaches Andrew how to defend himself against bullies. Then, Missy gets overwhelmed while back-to-school shopping with Jessi.

After Nick has a sudden growth spurt, Ms. Dunn takes the class inside the body of a teenager to learn about the wonders of puberty.

As Nick tries to figure out whether he has a shot with Gina, a mortifying encounter with Leah sends Andrew into a spiral of shame.

Sappy cards. Stupid clichés. And so much pressure. For Andrew, Nick, Jessi and friends, Valentine's Day is a total freaking minefield.

Connie gives Jessi a crash course in female pleasure, Maury tries to talk Andrew into sending a dick pic, and Nick lashes out at his new housemate.

A trippy haunted house hosted by Kappa Kappa Kill forces each of the friends to reckon with their biggest fears.

Eager to get his mojo back, the Shame Wizard drops in on swim class to torment the kids with bodily insecurities.

Jessi and Nick dip into her dad's stash of edibles, with mind-bending results. Andrew searches for the right moment to break up with Lola.

As the friends feverishly swap lists of the hottest kids at school, newcomer Ali stokes the flames by announcing she's pansexual.

Wracked with guilt, Andrew tries to keep his urges in check. Matthew's mom ices him out of the church bake=off after reading his texts.

Forced out of his own body by his smug alter ego, Nick fights back - with help from his friends and Gratitoad. Matthew comes out to his dad.

Nick follows Walter to the land of monsters and demands to see the person in charge. A New Year's Eve party inspires a flurry of grand gestures.

From itching to grooming to late blooming: There's no shortage of fodder for shame maven Rita St. Swithens in this special episode.