汤姆·卡切

Tom Cotcher

饰：Narrator

Ramon Gilsanz

饰：Self - Structural Engineer, Gilsanz Murry Steficek LLP

Greg Stebner

Greg Stebner

饰：Narrator

Bill Minutaglio

饰：Self - Author, City on Fire

Jeff Wise

饰：Self - Science Journalist & Author

Michael J. Massimino

饰：Self - Former NASA Astronaut