Andy Albrecht
— Himself - University of California
John Baldwin
— Himself - University of Cambridge
Ruth Durrer
— Herself - University of Geneva
Richard Ellis
— Himself - University of Cambridge
João Magueijo
— Himself - Imperial College
Dave Wark
— Himself - University of Sussex
John Webb
— Himself - University of New South Wales
Mathew Zajac
— Narrator (as Matthew Zajac)