Judith Croasdell

饰：Herself, Hawking assistant

史蒂芬·霍金

Stephen Hawking

饰：Himself

Nigel Whitney

饰：Narrator

丽莎·兰道尔

Lisa Randall

饰：Self - Harvard University

David Spergel

饰：Self - University of Princeton

朱利安·林希德-图特

Julian Rhind-Tutt

饰：Narrator

加来道雄

Michio Kaku

饰：Self - City University, New York

罗杰·彭罗斯

Roger Penrose

饰：Self - University of Oxford

Michael B. Green

Michael B. Green

饰：Self - University of Cambridge

John Schwarz

John Schwarz

饰：Self - California Institute of Technology