Five fabulous "Nailed It!" fans visit the test kitchen for a challenge so extra, we had to make it a bonus episode.

From self-frosting bubbling beakers to record-breaking rockets, these science-inspired sweets ask the impossible — and invite kids into the kitchen.

'Tis the season to be scary when the bakers try their hands at holiday cookies before constructing an elaborate gingerbread house.

Two high-fashion challenges put the bakers' hopeless skills to the test: fondant-covered doll cakes and an edible headdress heaped with fruit.

A gardening theme gives life to doughy gnomes atop miniature pies and a healthy-ish veggie-patch cake packed with carrots and zucchini.

Under the watchful eyes of an iconic cake designer, contestants decorate complicated cake pops and a bespectacled, three-tiered wedding cake.

The amateur bakers attempt to imitate the masters with gingerbread self-portraits and a sculpted cake replica of Michelangelo's David.

The bakers commit to re-creating wedding day desserts, including wedding band mini-cakes and a Vegas-themed masterpiece with moving parts.

From cupcakes celebrating famous Black women to a towering Tuskegee Airmen cake, this episode honoring Black history aims high — and achieves hilarity.

Terrible bakers take on a trio of festive holiday-hat mini cakes before tackling a pop-up Groundhog Day cake that's full of surprises.

The bakers summon their not-so-super powers to make Marvel-themed cupcakes with detailed cookie toppers and a daunting "Black Panther" cake.

The contestants turn back time -- and mangle time management -- with inside-out Neanderthal cupcakes and a tropical-flavored T. rex cake.

The pressure's on to make perfectly puffed éclairs and a layered bust of Napoleon Bonaparte for not one but two esteemed French chefs.

Terror awaits the contestants as they take on two technically demanding desserts: chocolate eggs and a layered sphinx cake, both full of surprises.

The contestants face their fears (with very sharp knives) when they carve an animal out of a watermelon and bend cake into the shape of a snake.

What's scarier than a cook who can't read a recipe? A trio of creepy-crawly bug cookies and a terrifying clown cake that tastes like cotton candy.

Stacked Greek god statue cupcakes and snake-headed Medusa makeover cakes take Herculean effort and skill — and these awkward results are epic.

Putting their own spin on travel, the bakers make terrible spiced-doughnut tourists and deflated hot-air balloon cakes. It's destination disaster.

Contestants loosen up a food scientist with a cupcake-cocktail pairing before serving him questionable slices of a bubbling volcano cake.

Dogged contestants are seeing double when they're asked to paint their portraits on a cookie before building an edible bust of Donald Trump.

The contestants raise the bar with two half-baked "high society" challenges: late-night munchie-inspired pancakes and a gravity-defying tea cake.

Jam-filled animal pastries and a coffeecake shaped like a sloth push the contestants out of their comfort zones — and the results are wild.

Baking duos go off the deep end with desserts inspired by the wonders of the ocean, including marine animal mini cakes and enormous edible octopuses.

Two daunting desserts -- a chocolate-filled "hot tub" and an open-mouthed shark cake -- have the hapless home cooks struggling to stay afloat.

A YouTube star known for her fondant work watches the bakers try to copy two of her most popular Japanese-themed cakes.