• 

  伊莎贝尔·霍金

  Isobel Hawking

  饰：Herself - Stephen Hawking's Mother

• 

  史蒂芬·霍金

  Stephen Hawking

  饰：史蒂芬·霍金 Himself

• 

  珍妮特·汉弗莱

  Janet Humphrey

  饰：斯蒂芬·霍金的姑姑 Herself - Stephen Hawking's Aunt

• 

  玛丽·霍金

  Mary Hawking

  饰：Herself - Stephen Hawking's Sister

• 

  巴兹尔·金

  Basil King

  饰：Himself - Hawking Family Neighbor

• 

  Derek Powney

  Derek Powney

  饰：Himself - Hawking Classmate at Oxford

• 

  Norman Dix

  Norman Dix

  饰：Himself - Hawking Classmate at Oxford

• 

  Robert Berman

  Robert Berman

  饰：Himself - Hawking Tutor at Oxford

• 

  Gordon Berry

  Gordon Berry

  饰：Himself - Hawking Classmate at Oxford

• 

  罗杰·彭罗斯

  Roger Penrose

  饰：Himself - Professor at Cambridge

• 

  丹尼斯·西阿玛

  Dennis Sciama

  饰：Himself - Professor at Cambridge

• 

  约翰·惠勒

  John Wheeler

  饰：Himself - Astrophysicist

• 

  Brandon Carter

  Brandon Carter

  饰：Himself - Astrophysicist

• 

  约翰·泰勒

  John Taylor

  饰：Himself - Astrophysicist

• 

  基普·索恩

  Kip Thorne

  饰：Himself - Research Scientist at Cambridge

• 

  Don Page

  Don Page

  饰：Himself - Hawking Student

• 

  Christopher Isham

  Christopher Isham

  饰：Himself - Astrophysicist

• 

  Brian Whitt

  Brian Whitt

  饰：Himself - Hawking Student

• 

  Raymond Laflamme

  Raymond Laflamme

  饰：Himself - Hawking Student