Reparto (por orden de créditos)
Anthony Quayle
Self - Narrator
Chuck Yeager
Self
John Young
Scott Crossfield
Bill Dana
Self - X-15 Test Pilot
Frank Whittle
Milt Thompson
Ken Kellett
George Felton
Self - Pilot
Michael Daunt
Self - Gloster E28-39 Test Pilor
E. Kristinn Olsen
Self - Director Icelandair
Burt Rutan
Arthur Raymond
Robert Vaughn
Narrator (US version) (1987)