All Cast
Stephen Hawking
Self
Isobel Hawking
Self - Stephen Hawking's Mother
Janet Humphrey
Self - Stephen Hawking's Aunt
Mary Hawking
Self - Stephen Hawking's Sister
Basil King
Self - Childhood Friend
Derek Powney
Self - Oxford Classmate
Norman Dix
Robert Berman
Self - Stephen Hawking's Tutor
Gordon Berry
Roger Penrose
Dennis Sciama
John Archibald Wheeler
Brandon Carter
John R. Taylor
Kip Thorne
Don Page
Christopher Isham
Brian Whitt