Jim Gates

基普·索恩

Kip Thorne

饰：Self - Theoretical Physicist, Caltech

Erik Thompson

饰：Narrator,

史蒂芬·霍金

Stephen Hawking

饰：Self - Theoretical Physicist

Janna Levin

饰：Self - Theoretical Cosmologist, Barnard College

Hakeem Oluseyi

饰：Self - Astrophysicist, Florida Institute of Technology

Leo Szilard

Leo Szilard

饰：Self - Physicist,(archive footage) (as Leo Szilard)

Robbert Dijkgraaf

饰：Self - Theoretical Physicist, Institute for Advanced Study

阿尔伯特·爱因斯坦

Albert Einstein

饰：Self - Theoretical Physicist,(archive footage)

布赖恩·格林

Brian Greene

饰：Self - Theoretical Physicist, Columbia University

Edwin Hubble

饰：Self - Astronomer,(archive footage)