• 

  Lee Whittlesey

  饰：Self - Yellowstone Explorer

• 

  Roy Renkin

  饰：Self - Fire Ecologist

• 

  Jerry Holzer

  饰：Self - Yellowstone Hiker

• 

  Travis Wyman

  饰：Self - Yellowstone Bear Management

• 

  Robert Wilson Seymone

  饰：Self - Narrator

• 

  Bob Landis

  饰：Himself - Photographer

• 

  Hank Heasler

  饰：Himself - Yellowstone Park Geologist