Casting principal
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)