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From flame-breathing... to candy-dispensing! The CrunchLabs crew carves out pumpkin designs with some serious science to impress Mark and take top prize.

Who knew the secret to magic was diapers?!? Using everyday objects, Mark reveals the mechanics behind magic tricks so you can mesmerize any audience.

Mark and Science Bob attempt to shatter a world record with a backyard swimming pool — and trunkloads of giant, overflowing slime foam.

Underneath 1.3 billion tons of lake water, Mark uses cutting-edge tech and scanning sensors to reveal the submerged secrets of a lost city.

Candy bowl thieves, beware! With Jimmy Kimmel's help, Mark prepares for trick-or-treating porch pirates with his booby traps of silly string and more.

Inspired by a young fan's resilience, Mark engineers the world's greatest wheelchair with self-balancing wheels, a cupholder and even a disco ball.

More upgrades. More glitter. More cans of fart spray! Mark turns his holiday tradition way up with enhanced bait packages designed to bust porch pirates.

Take a tour of Mark's super-massive science lab, complete with secret passageways, a giant foam pit and several hidden engineering Easter eggs.

Mark dives deep into the world of bed bugs to debunk myths, run experiments with experts, and learn what to do to thwart the tiny pests.