Oh no! An ancient mummy is haunting the Fermentation Lab, munching on umami-filled ingredients like stinky cheese. This gives John Henson the idea for "umummy" desserts, and he tasks the bakers with creating sweet mummy treats that feature umami ingredients like red miso, aged parmesan, gochujang or soy sauce. Then, it's "bone appetit" for judges Carla Hall, Zac Young and Stephanie Boswell as the bakers get inspired by the lab skeleton, Skelly, to create Skelly's forgotten desserts, where they must use Halloween mini chocolate bars to create skeletal desserts.

The final bakers take on two very difficult challenges inspired by the past -- all leading up to a time-traveling monster mash! In the Dissection Lab, John Henson works on some gross anatomy, and he asks the bakers to create desserts with gummy hearts that will be "dissected" by judges Carla Hall, Zac Young and Stephanie Boswell. Then in the Quantum Physics Lab, John hops into a time machine and journeys to the ancient past for inspirations like medieval vampires and early aliens for time travel cakes. The best baker heads into the future with the Halloween Baking Championship title and the $25,000 prize!

John Henson has a problem in the haunted Paranormal Research Lab, and he's hoping to summon the spirit of Beetlejuice to help broker a deal with the other spirits. To butter up the ghost with the most, John asks the bakers to make black and white desserts using black and white ingredients. Then, John challenges the bakers to create Shrinker desserts that feature a tiny desert on top and large dessert on the bottom. In the end, judges Carla Hall, Zac Young and Stephanie Boswell banish one baker to the cyro-chamber.

John Henson catches a spirit doing some imaging in the X-ray room! The films the spirits have been taking of themselves are monstrous, and John wants the bakers to use these X-rays as templates for build-a-spirit desserts. Then, the bakers enter the lab basement where the portal to the underworld is kept locked behind a secure heavy door, but lately ghouls have been letting all sorts of otherworldly creatures out! The bakers make a portal entremet that reveals an otherworldly creature to judges Carla Hall, Zac Young and Stephanie Boswell.

The three remaining bakers construct a “Ghostembouche,” or ghostly version of a croquembouche tower. Then they face the final challenge of creating a bleeding zombie cake. When the bloodbath is over, the survivor is named Halloween Baking Champion!

Five bakers remain, and the creepy, dangerous donuts they whip up in the first challenge are a sight to be seen. Then, for the main challenge, the bakers dig even deeper into their baking skills with graveyard pumpkin desserts that are to die for. But one baker won't make it out alive.

The final four bakers take on a haunted house cake battle for the title of Halloween Baking Champion and the $50,000 grand prize!

A group of talented bakers enter the fortune-telling tent at the Circus of Dread in the pre-heat challenge. The competitors are tasked with creating tarot card desserts featuring blood orange, fig or passion fruit. The bakers then enter the Creepy Clown Hall of Fame in the main heat where they create impressive desserts that will land one of them in the finale.

John Henson kicks off the competition by revealing all the skeletons in his family's closet to inspire the eight bakers as they make scary skeleton desserts. The main heat is monster madness as the bakers conjure up monster-under-the-bed creations.

Ten bakers explore the Chemistry Laboratory at Henson Labs, where the safety rating is negative 35. Lately, the spirits who haunt the lab have been demolishing all the beakers and petri dishes, so host John Henson leans into this devastation and tasks the bakers with creating broken glass desserts that feature sugar glass. Then, there's been a horrible spill in the Chem Lab, so John has a little fun with it and asks the bakers to create sinister bubbling desserts inspired by the toxic mess. Judges Carla Hall, Zac Young and Stephanie Boswell test their poison tolerance before sending one baker to the cryo-freeze.

Down to six bakers and it's time for a big, bad, monster mash. The bakers spook the judges with their sculpted scary treats and then mash up flavors and themes to create devilishly delicious desserts! But one baker's creepy concoction doesn't cut it and gets the axe.

Nothing says Halloween more than scary monsters, and in the pre-heat, the seven bakers must create creepy bite-sized monster treats. For the main heat, zombies attack as the bakers are faced with whipping up a zombie dessert that makes the judges hungry for a bite.

The competition begins with a deliciously difficult pre-heat as the eight Halloween bakers weave spider web desserts with creatures trapped inside. In the main heat, wily witch hunter John Henson challenges the bakers to create melting desserts that reveal a Halloween item inside.

Inspired by a skull man, the bakers enter the graveyard to bring skull desserts to life in the pre-heat; for the main heat, the bakers must create a nightmare cake based on common nightmare themes; the bakers must face their fears to come out on top.

Five remaining bakers take a light, sweet and utterly harmless dessert and head to the dark side; it's a main heat filled with frights as the bakers make scary mask desserts to spook the judges; one baker is eliminated at the end of the round.

It's bridal season for Halloween lovers and since bridal showers often have petit fours, the bakers are creating "petit horrors" in the pre-heat challenge. In the main heat, it's time for a Halloween wedding! Each happy couple -- vampire and troll, werewolf and mummy, skeleton and robot, witch and goblin, zombie and ghost -- gets a unique Halloween wedding cake.

The remaining four bakers go digging to create terrifyingly tasty grave-robber desserts. Then for the main heat, it's a night at the cemetery as the competitors sculpt marbled tomb cakes.

Descending into a spooky cellar is enough to make any baker's blood run cold, and blood is always on the menu for a vampire party. Host Carla Hall asks the eight remaining bakers to team up and create desserts for a vampire buffet to satisfy the bloodsuckers' appetites as well as Carla and the other judges, Stephanie Boswell and Zac Young.

In the devil's den, host Carla Hall challenges the six remaining bakers to conjure up a devilish dessert using unusual ingredients, such as sauerkraut, beets, tamarind paste and canned tomato soup. The competitors must get creative to avoid the fiery pit of elimination and impress Carla and the other judges, Stephanie Boswell and Zac Young.

Host Carla Hall invites the five remaining bakers to a party in the haunted ballroom. For a spot in the finale, the competitors must create impressive costume cakes that will dazzle Carla and the other judges, Stephanie Boswell and Zac Young.

A monster has ransacked the kitchen and is on the loose! The bakers work together in the pre-heat challenge to create a 3-D suspect sketch out of pate a choux to help track him down. The sketch helps puts the monster behind bars but now he's hungry for the main heat challenge that involves monster-sized Halloween deserts like giant cupcakes, pies, cream puffs and more.

The six remaining bakers team up to create desserts that pay tribute to the iconic Addams Family -- scary on the outside and sweet on the inside. During the main heat challenge, the wonderfully creepy family is honored with “dead velvet” cakes.

As their nightmare begins in the grand foyer, host Carla Hall encourages the 10 competitors to reveal their deepest fears by baking haunted house cakes. Then, the bakers compete in the dagger game for a reward that could be the difference between life and death in the competition judged by Carla, Stephanie Boswell and Zac Young.

The seven remaining bakers continue their journey through the haunted house to the creepy nursery. Host Carla Hall challenges the competitors to bake 3-D demon doll cakes with a diabolically assigned flavor to be judged by Carla, Stephanie Boswell and Zac Young.

Host John Henson's "mummy" issues inspire the pre-heat challenge of crepe cakes. In the main heat, the five remaining bakers use classic fall ingredients to create jack-o'-lantern pies that are half scary and half sweet.