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.

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.

Andrew struggles to blend in after a growth spurt, Nick worries his hormones are out of whack, and Jessi and Jay get a taste of the teen runaway life.

Family blowups, secret liaisons and an unflattering dress make Jessi’s bat mitzvah a night to remember.

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.

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

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

Andrew tries to drown his sorrows in a sea of porn, only to become hopelessly addicted. Coach Steve becomes a suspect in a murder spree.

While helping Greg move into a seedy bachelor complex, the boys and their dads debate what women want — and what it means to be a man.

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.

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.

Andrew struggles to keep the Hormone Monster in check as he works with Missy on a science fair project. Jessi and Matthew have fun at Jay’s expense.

Nick drags Andrew into the city to visit an old camp crush, but the day doesn’t go as planned. Jay embarks on an emotional journey with his pillow.

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.

While the boys head to Jay’s for a testosterone-fueled sleepover, Jessi throws a party of her own and gets caught up in mean-girl drama.

A trailer for a new movie starring The Rock leaves Andrew questioning his sexuality. Jessi and Nick’s budding romance turns ugly fast.

A field trip goes from awkward to mortifying as Jessi navigates the demands of coupledom and gets her first period — inside the Statue of Liberty.

As Andrew falls under the spell of the randy Hormone Monster, his buddy Nick becomes obsessed with the lack of changes in his own body.

At their first high school party, Andrew discovers his talent for drinking games, Nick hopes for a shot with Danni, and Missy meets a potential rebound.

Andrew takes a liking to his new neighbor — and her mom. Nick wants to be more than Danni’s friend, but her entanglement with Travis gets in the way.

Big Mouth goes global for a very special episode as Maury and Connie take a closer look at how kids around the world experience puberty.

As graduation day nears, Nick must decide if he will attend Cobblestones Academy while Andrew goes on an apology tour after being voted “Grossest Human.”

While Andrew and Nick follow Judd to Brooklyn to score drugs, Jay gets jealous of Kurt and Lola’s relationship, and Jessi oversteps at Matthew’s house.

With no distractions, Andrew’s schoolwork improves — winning his father’s praise. Jessi goes a little too far when trying to emulate cool, mature Leah.

A doctor puts Andrew on testicular rest, Nick asks Jay to help him get in shape for high school and Jessi becomes fascinated by Caitlin’s breastfeeding.

The Big Mouth kids start high school! Andrew looks inside himself to solve his problem with Pumbaa while dread stops Missy from attending her first day.

With two months left in eighth grade, the incoming freshmen tour their new high school with junior hosts while Jay evades his terrifying brothers.

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

While Andrew and Nick deal with parental crises, Jessi meets her new sibling, and Matthew realizes he’s made Jay into a different person.

Elijah tries to figure out why he doesn’t have the same urges as his friends. A jealous Andrew hops a train to Vermont to surprise Bernie

Lola hits the jackpot — in more ways than one. Missy takes her dad to Elijah’s church. The Birches make a plan to get rid of their new housemate.

The voice of a slick, new tech accessory hypnotizes people into doing things they wouldn’t normally do. Missy grapples with the concept of sin.

While Andrew prepares for a momentous evening with Bernie, Nick sets out to meet his secret grandfather, and Jay cooks up some romance for Matthew.

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

After being snowed in with their families, the restless friends flock to Bridgeton’s latest make-out spot. A new classmate catches Missy’s eye.

A viral quiz about naughty deeds sparks arguments and unlikely new friendships. Matthew plans a baby shower for Maury.

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

A DNA test leads Nick to uncover a wee family secret. Jay insists on introducing Matthew to the Bilzerian clan. Andrew puts his lovebug to the test.

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…

Classic holiday stories get a naughty makeover in this special episode hosted by puppet versions of Maury and Connie.