When it comes to neck strength, John Evans is a legend. This six foot five, 24-inch neck ‘IRON MAN’ has 32 world records to prove it! Then, Daniel meets Hiro in Seattle. Using slomo cameras, motion capture and impact dynamics, we find out if Hiro Suzuki’s yoyo skills push the limits of speed and dexterity. Hiro then enters a duel with a semi-automatic handgun, to see if he really has turned the yoyo into a weapon. Next, Daniel meets professor Kevin Warwick, the world's leading expert in Cybernetics, who became the worlds first Cyborg in a ground breaking set of scientific experiments, using himself as a guinea pig, surgically inserting technological implants connected to his central nervous system. And finally, even more powerful than Current Mohan, Slavisa Pajkic ‘Biba’ from Serbia claims to be able to take a hit of 20,000 volts !

The search is on to find more real-life superhumans! First Daniel is in Canada to meet Pat Poviliatis, a man who boasts his hands are tough enough to withstand the deadly jaws of a steel-tooted cougar-trap. Sam Whittingham claims to have built the fastest human powered machine on the planet. His combination of design genius, and physical strength could make him the ultimate superhuman man with a brain like a hard drive. Brad Williams claims to have Super Autobiographical Memory, which means his brain has the power to remember and catalog almost everything that has ever happened to him, down to the tiniest details. And Annalisa Flanagan is rumored to have the loudest voice on earth, 122db. That’s enough to cause physical pain and permanent ear damage.

Rene Richter says he has the strongest teeth on earth, capable of bending coins. But we discover his strength lies in his jaw, which Rene says allows him to lift over 1000lbs. Kirby Roy has spent his life trying to become impervious to pain, using a controversial martial art called Combat Qi, he claims he is able to take strikes of limitless power to the most sensitive parts of the human anatomy. Daniel calls in some of the world's hardest hitters and kickers to put that to the test. Internet videos show college quarterback Alex Tanney performing mind-blowing trick throws. They look impossible, so Daniel wants Alex to prove he's for real. It's rumored Eric Scott is the best jet-pack pilot on earth, and he intends to prove it, by flying over a lake with no safety measures and only 30 seconds of fuel.

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.

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.

Dean Sheldon claims to be immune to America's deadliest scorpion venom. Daniel asks him to prove it by collecting 22 wild scorpions form the Arizona desert, and putting them in his mouth, all at once! Kanzawa Sensei claims to be able to put any animal into a trance using mind control. Daniel brings him to a California to prove his powers on an alpaca ranch, before facing the ultimate challenge. George Aldrich is Nasa's supersniffer, employed to scent test every object that goes into space, as he says \"you can't open a window on the space shuttle!\" But how does his power compare to a sniffer dog? Daniel, and LAPD sniffer-dog trainer Lamb Lambert, set George a challenge. Martin Strehl claims he has swum the entire length of the Amazon, 3000 miles, a feat no other human has achieved.

Stan sends Daniel to meet 38-year-old German speed fanatic Dirk Auer, who claims that with his incredible turbo powered rocket backpack and skates, he can reach amazing speeds. Guy Bavli claims he can move objects around a room using the power of his mind. We take him to a hardware store where he bends nails and cutlery off the shelves–and even appears to move objects without touching them. Daniel meets Nigel on a running track made of broken glass. A pain expert examines Nigel's physiology… if he feels pain in the rest of his body, could his feet hold the key to switching off pain? Steve Woodmore claims to be able to talk at a \"superhuman\" speed of 637 Words per Minute! That's 10.25 Words per second, four times faster than the average person.

Matthius Schlitte was born with Proteus syndrome, giving him one arm MUCH bigger than the other. He has used this genetic difference as a gift,and through training, turned himself into a top arm wrestler, capable of beating men twice his size. Butcan he take on a super-charged robot, literally built to arm wrestle? Jean Yves Blondeau has designeda 32 wheel roller-suit that turns him into a human rollerskate with incredible speedand agility. Daniel wantsto push the Rollerman to the max, pitting him against a 100mph go-kart. Jack Dagger claims to be the deadliest knife thrower on earth. He sayshe can hit any target, no matter how small or how fast it is moving. Will Daniel survive a William Tell-esque apple on the head stunt? It's rumored Wolfgang Manicke and his posse have the power to destroy buildings with their bare hands. Daniel takes Wolfgang to a scientist to analyze his strength.

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.

Alexander Levit was born blind. Living in Los Angeles, he claims to not only see shapes but colors and writing on screens in "Supersight." In the same area lives Mikhail Vasilyev, "Human Magnet" whose skin is adhesive and can hold non-magnetic objects, too. Stig Severinsen is "Dolphin Man" who can hold his breath 20 minutes. "The Human Toolbox" is Brad Byers of Vancouver, who can stick long objects into a channel in his head that begins at his nose.

Daniel meets Ho in Kuala Lumpur, where he demonstrates 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. Next, 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! Orlando Duque demonstrates a breath-taking ability–diving from the same height as a twelve-story building and hitting the water at 55MPH without injury. Daniel and an Orthopaedic Surgeon Dirk Dolbere, investigate the forces Orlando can withstand. Joe Eigo says his jump defies gravity and insists he never uses trick photography, crash mats or safety wires.