G-force, or gravitational acceleration, can impact the human body by making it increasingly heavy or weightless. However, when too high, g-forces can be incredibly deadly. Sean Tucker has trained his body to withstand g-forces that would cause any normal person’s brain to shut down. With the aid of Professor Alan Hargens of UC San Diego, Host Tyler Harcott is subjected to various degrees of g-force in order to understand the remarkable influence of gravity on our bodies. Harcott watches in amazement as his body changes weight with even small changes in gravity. Sean, however, goes face to face with a huge amount of g force – greater than that experienced by a fighter pilot. While these pilots need special protection to keep them alive, Sean takes to the air completely unassisted. Is it possible for a man to be immune to g-force? Will Sean make it out in one piece?