At high altitude, low oxygen causes hypoxia, altitude sickness and very quickly, death. But Ang Rita Sherpa claims he's climbed Everest 10 times with no extra oxygen. Daniel takes him to a leading Altitude Research facilityto witness the effects of altitude in a hyperbaric chamber. It's said spider-silk is the strongest material on earth. And Randy Lewis says he has founda way to copy it--by breeding a herd of goats with spider DNA, creating a goat that can produce spider-silk in its milk? Stan wants Daniel to find out if this could bethe first step to a real life Spiderman. It's rumored Tori Allen can climb Like Spiderman, but in fact it seems she was brought up with monkeys and has actually mastered many of their climbing tricks. Stan Lee created Rocket Racer, a super-powered skateboarding nemesis for Spiderman. But Bob Burnquist is said to perform jumps on his skateboard that have made Stan's comic books a reality.

This time Stan wants Daniel to investigate four people who claim to have superhuman heat tolerance, performing potentially deadly demonstrations that push themselves, and the human body, to new limits. Daniel puts them to the test to find out if they really can stand the heat! Ted Batchelor claims he is fireproof. At Salinas Airfield, Ted attempts the longest full body burn of all time, running over 500 feet, whilst burning at temperatures of 2400 Fahrenheit. Kann Trichaan from Thailand is rumored to be immune to the searing heat of boiling cooking oil, and appears to feel no pain, even when submerging his hands for seconds at a time. Anandita Dutta Tamali is the most chilli-proof human on earth, but can she withstand pepper spray? Marshall Ullrich is said to be immune to the lethal effects of heatstroke, but Daniel tests his heat tolerance by challenging him to run in potentially fatal temperatures, in an oven!

In a temple in Kuala Lumpur, Shaolin monk Hu Qiong demonstrates his unbreakable body by smashing steel on his head, and spears in his throat. Bio-mechanic professor Dan Voss measures the forces at play to prove this is real. Dan watches Hu, as he attempts to push an electric drill into his own temple for a whole minute. Then, Daniel arrives in San Diego to witness Chad Netherland hold back a 500 bhp car. He calls in a sports physiologist to examine Chad’s technique, and to work out the real forces at play. Next, Daniel brings Dickinson Oppon from Ghana to South Africa to find out if the rumors of his superhuman control over his stomach are actually true. And finally, Daniel meets Byron Ferguson at an archery range where super-slo-mo images capture his accuracy in detail. Then eye-tracking technology is brought in to see if his eyes actually track the targets, or is it just luck?

Daniel Browning Smith is in Vegas to meet Brian Jackson who blows up a hot water bottle until it explodes. Daniel takes Brian to a lung specialist to measure the power output and pressure of his lungs. Lu Deyuan's extraordinary, traffic-stopping superhuman ability is eye watering! Daniel meets Lu in a Kuala Lumpur dockyard where he's hanging steel bars from his eyelids. Lu says he feels no pain and doesn't suffer from any injuries. Could Anthony Kelly have the fastest reflexes in the world? Daniel meets him catching tennis balls at 80mph, and use a high speed camera to capture his technique. At a Detroit Dojo, Daniel meets Japanese Nunchuck Master Hiroki deadly in the martial art of nunchaku combat. Cindi Bir and Daniel test his ability by challenging his accuracy with a baseball pitching cannon.

Genetic mutation produces incredible comic-book superheroes. But Stan wants Daniel to meet four real people who claim to have a difference in their physiology, that makes them superhuman! Mr. Duong claims that his entire family possess a genetic mutation that makes them completely immune to electrocution, and can hang from a live pylon and survive. Orlando Serrell claims he was turned into a real life genius after being hit on the head, and can remember the exact weather every day since the accident. Thanks to a unique genetic mutation, Joshua Carter is able to perform a staggering feat of contortion, that rewrites the limits of the human body. Kortney Olsen claims to have thighs even stronger than a python. Daniel tests her crush force, to see if she has turned her body into a human weapon.

Creating teams of comic book heroes requires a combination of incredible but unique superpowers. This time Daniel meets four people with totally separate powers…but could they be ultimate team of real life superhumans? Adam Winrich claims to have extraordinary accuracy with a whip and has turned this old-school object into a comic book weapon just like a real life Whiplash! Daniel seeks out Will Trubridge, a free-diver that claims he can dive deeper than anyone else with no mechanical assistance. Is he really a human submarine? Joel King claims he’s built a super-powered skateboard, capable of breaking the speed limit… on the freeway. Daniel watches his latest record attempt, where any mistake could be fatal.

First, Daniel meets Ho in Kuala Lumpur, where he demontrates his incredible ability, smashing through the rock hard exterior of a coconut with his index finger. Dan Voss measures the force of his finger of steel. And a load hammer replicates this force on a coconut. Then he attempts to smash the shells of 3 coconuts in 30 secs. Then, Daniel meets Moses Langan in a busy Detroit shopping mall, where he has drawn a crowd with his spectacular ability. He appears to be able to turn his legs 180 degrees, and walk forwards! We use an open MRI to see what is going on inside his skeleton to allow this to take place. Next, Orlando Duque demonstrates a breath-taking ability, diving from the same height as a twelve-storey building and hitting the water at 55MPH without injury. Daniel and an Orthopaedic Surgeon Dirk Dolbere, investigate the forces Orlando can withstand. They then witnesses Orlando’s latest feat and are blown out of the water! And finally, Joe Eigo says his jump defies gravity and insists he never uses trick photography, crash mats or safety wires. Could his body be engineered differently? Sports physiologists use motion capture to investigate and the scientist is amazed by Joe’s gravity-defying final demo.

The ultimate superpower is flight, and Yokke Sommer is rumored to have achieved it–coming as close to a bird as any human has ever achieved. Daniel meets him on a 1000ft cliff in Norway, the site of many tragic deaths, where Yokke wants to prove his power by flying at over 120 mph just 3ft from the cliff face. Ram Barkai claims to be immune to cold–regularly swimming in temperatures cold enough to kill. He proves his unique abilityin the Nordic fjord-lands, before Daniel sets him the challenge of swimming a kilometre in water just 1 degree above freezing. Man has evolved to walk upright, and has gone on to be able to run faster and faster. But Roland Wagner has become the fastest backwards runner on earth and says his technique is actually better for the body. Hands of fire? Master Zhou claims he can produce heat inhis hands hot enough to boil water. Daniel puts him to the test to try and find an explanation.

This time Stan wants Daniel to meet four people who claim to be fear-proof, and push man’s limits to the very edge, performing staggering feats at extreme heights that would paralyze any normal person with fear. Julio Munoz claims to have the ability to switch off fear, and wants to prove it by attempting one of the scariest stunts of all time that requires superhuman nerves of steel. Tyler Bradt takes fearlessness to a whole new level, kayaking over waterfalls hundreds of feet high. Andy Lewis is a fearless slackliner who uses no safety harness when traversing deadly canyons on an inch-wide rope. Gary Connery has dedicated his life to become the first human to jump from an aircraft and land without a parachute, and survive. Daniel heads up to over 3000 feet to watch Gary attempt this insane feat.