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

The bakers do their best to make jelly-filled doughnuts fit for a pirate before tackling an edible tower with a princess on top.

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

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

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

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.

It's "happily ever after" or bust when the bakers try to make fairy tale cupcake pops, then stack cakes in the form of a majestic unicorn.

The cooks divide and conquer to fill sections of a savory snack stadium before building a cake that looks like a barbecue grill.

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

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.

Space-themed challenges throw the hapless bakers for a loop when they're asked to make cosmic cupcakes and a supersized solar system cake.

Five fabulous “Nailed It” fans visited the test kitchen for a challenge so extra, we had to make it a bonus episode.

Two bookish treats inspired by literature set the bakers up for epic fails: Shakespearean stained-glass window cookies and a pop-up "Moby Dick" cake.

Edible ice cream boom boxes made with liquid nitrogen and a fresh and fly fondant-covered cake? Oh, snap – that sounds like a '90s challenge.

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

The bakes go for the gold – and miss masterfully – with sports-medal cookies and an elaborate swim cake that's topped with a waffle cone torch.

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

A Western-themed round inspires deep-fried cowboy-duck doughnuts, a root beer-infused rodeo cake...and really bad flavors.

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

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

A funny, furry pet theme finds the cooks concocting giant exotic-animal cookies, then re-creating Nicole's adorable dog, Clyde, in cake form.

The bakers make candy apple aliens and a sculpted Loch Ness monster cake based on mysterious creatures from outer space... and the freshwater depths.

Treats inspired by "Mr. Chocolate" Jacques Torres include lollipop portraits and a cake spiced with cocoa and cayenne. Mais oui laugh? But of course!

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.

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