Finlay Macrae
Stephen Hawking (teenager)
Nathan Chapple
Stephen Hawking (young adult)
Buzz Aldrin
Himself - Astronaut, Apollo XI & Gemini XII
Gordon Berry
Himself - Oxford University Friend
Richard Branson
Himself - Virgin Group Founder, Virgin Galactic
Bernard J. Carr
Himself - Stephen's PhD Student 1972-1975
Himself - Actor & Comedian
Judith Croasdell
Herself - Stephen's Personal Assistant
Pete Denman
Himself - Interaction Designer, Intel Labs
Judy Fella
Herself - Stephen's 1st Secretary
Kitty Ferguson
Herself - Stephen's Biographer
Peter Guzzardi
Himself - Book Editor, Bantam Books
Sarah Hardenberg
Herself - Stephen's Cousin
Don Page
Himself - Stephen's Research Assistant 1976-1979
Roger Penrose
Himself - Mathematical Physicist
Paul Shellard
Himself - University of Cambridge
Kip Thorne
Himself - California Institute of Technology
Brian Whitt
Himself - Stephen's PhD Student 1982-1988
Jonathan Wood
Himself - Stephen's Graduate Assistant