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. Could Martin's body somehow be immune to fatigue?