Steve Herringer

饰：Himself - Narrator

Bruce Robison

饰：Self - Marine Biologist

Kris Holm

饰：Self - Extreme Unicyclist

Daniel Kish

饰：Self - Flash Sonar Trainer

Shaf Keshavjee

饰：Self - Research Physician

Anthony Gaspari

饰：Self - Immunologist

Whitney Bragagnolo

饰：Self - Host

Robert Lee

Robert Lee

饰：Self - Narrator

Frazier Grandison

饰：Self - Test Pilot

李瑞

Ray Li

饰：Self - Inventor

Theo Jansen

饰：Self - Kinetic Artist

Miles Daisher

饰：Self - Wingsuit Flyer

Willard Wigan

饰：Self - Microsculptor

Zlata

饰：Self - Contortionist