Kevin and Grant become monsters of the fairway when they turn a golf cart into a monster truck. Plus, the guys take on the science of Spider-Man.
Kevin and Grant take on the role of rocket scientists and attempt to design the ultimate Trash Can Rocket using the lens of an old projection TV.
The guys engineer a plan to survive a three-story fall without a parachute. Plus, how will they fare when trying to escape the powers of homemade quicksand?
Kevin and Grant turn science into speed and turbocharge a Rocket Skateboard. Using a batch of homemade supersonic rocket fuel, what could possibly go wrong?
Kevin and Grant build a homemade hydrofoil. Can they make it go so fast it glides over the water? The guys also learn if you can cook a steak with...
Kevin and Grant test their skills when building a homemade hovercraft capable of crossing land and sea. Plus, how can a merry-go-round produce G-forces?
While exploring the principles of armour design, Grant and Kevin challenge each other to lawnmower jousting for backyard glory. What could go wrong?
Kevin and Grant outfit cars with armour and weapons and face off in a demolition derby. Later, they build a lie detector and a chainsaw-powered chairlift.
Kevin and Grant hit the streets to make the fastest motorised trike. Plus, they turn a childhood game into a risky test of accuracy with their water slide.
Can Kevin and Grant build an amphibious motorcycle that drives on the water? In an ultra-scientific mini-golf competition, who can make the most holes-in-one?
Kevin and Grant try to survive a 30mph ride in their Off-Road Soap Box Racers. Plus, a classic homemade Volcano gets supersized into a 3-stage eruption.
The guys turn chariots into speed demons by replacing horses with powerful motorcycles. Kevin and Grant find out what it takes to escape from Alcatraz.
Kevin and Grant turn a blast of air into a ring of fire when they build a Vortex Cannon. They use quantum physics to send a Levitating Racer around a...
Kevin and Grant build a submarine and see if they can survive at the bottom of a pool, supersize wind-up cars, and see if duct tape can stop a bullet.
Grant and Kevin soar to new heights with a Giant Paper Airplane that can fly over 200 yards. Plus, they use pneumatics to create the Ultimate Beer Delivery.
Kevin and Grant build supersized Rock 'Em Sock 'Em Robots, build a motorcycle with one wheel, and what it takes to survive the perfect storm.
Kevin and Grant modify a go-kart to beat a truck in a head-to-head drag race. Plus, the guys play paintball in the dark with homemade night vision goggles.
A balloon-powered sleigh is built to deliver presents, snow is made and covers Kevin's front lawn and holiday decorations are deployed in record time.
Kevin and Grant find a way to chill a drink in less than a minute. Plus, they play backyard astronaut in an attempt to send a camera to the edge...