Heather Couper

饰：Herself

基普·索恩

Kip Thorne

饰：Himself

史蒂芬·霍金

Stephen Hawking

饰：Himself

Hans Bethe

Hans Bethe

饰：Himself

理查德·查伯兰

Richard Chamberlain

饰：Narrator

Kevin Krisciunas

Kevin Krisciunas

饰：Himself

Andrew Lange

饰：自己

Margaret J. Geller

饰：自己

John Lowry Dobson

饰：自己

Leo Blitz

饰：自己

David A. Allen

饰：自己

Vera C. Rubin

饰：自己

Michael A. Dopita

饰：自己

Steve V.W. Beckwith

饰：自己

Brad Smith

Brad Smith

饰：Self,unknown episodes,