Speed, the ability to react and move, can often mean the difference between life and death in the animal kingdom. Some animals have evolved into championship fliers, swimmers and runners.

  Bob and John have followed hundreds of international declassified files all the way from Berlin to Chile, where they now investigate a secretive German community with reported Nazi ties.

President Barack Obama reflects on his historic presidency; we feature his thoughts on where the country was when he was elected, where it is now, and where he sees it going under his successor's command.

A new hunt for the mysterious Zodiac Killer unearths a complicated cipher that may contain the killer's name, and links between the killer and an unsolved case. A prime suspect with code training emerges.

  Thousands of people from every part of the world have reported being abducted by aliens, could the alien abduction phenomenon be true? But if so, why are people being taken? Why are they being returned?

  When a client asks Danny to put the Count's Kustoms spin on a muscle car of his choice, the Count goes old school with a 1967 Camaro; Mike and Shannon find a rare 1968 Barracuda.

Bob & John's dual investigation continues in Europe & Argentina. Still deep in the jungles of Misiones, Argentina, Tim & Alasdair unearth clues that could make this area a Nazi militarized compound.

  Ivar the Boneless meets his match in Bishop Heahmund, while Floki returns to Kattegat and Bjorn receives a lavish welcome in North Africa.