Michael Mosley
Self - Presenter (8 eps)
Paul Vaughan
Narrator (voice) (5 eps)
Alice Roberts
Self - Presenter (4 eps)
Hannah Fry
Herself - Presenter (4 eps)
Kelly Hunter
Herself - Narrator (2 eps)
Helen McCrory
Narrator (2 eps)
Steven Mackintosh
Himself - Narrator (2 eps)
Xand van Tulleken
Presenter (2 eps)
Kevin Fong
Self - Presenter (2 eps)
Helen Czerski
Self - Presenter (2 eps)
Iain Stewart
Self - Presenter (2 eps)
Richard Feynman
Self (2 eps)
David Lutyens
Self - Reporter (2 eps)
Dilly Barlow
Narrator (2 eps)
Andrew Scott
Narrator (1 eps)
Rupert Penry-Jones
Himself - Narrator (1 eps)
Adrian Lester
Himself - Narrator (1 eps)
Dr Adam Rutherford
Presenter (1 eps)
Hugo Speer
Narrator (1 eps)
Gabriel Weston
Presenter (1 eps)
David Harewood
Narrator (1 eps)
John Hannah
Himself - Narrator (1 eps)
Alexander van Tulleken
Himself - Presenter (1 eps)
Peter Gibbs
Presenter (1 eps)
Giles Yeo
Presenter (1 eps)
Adam Pearson
Presenter (1 eps)
Chris van Tulleken
Presenter (1 eps)
Daniel Kahneman
Presenter (1 eps)
Toby Macdonald
Presenter (1 eps)
Uta Frith
Presenter (1 eps)
Anne Glover
Herself - Presenter (1 eps)
Dr Zoe Williams
Herself - Presenter (1 eps)
Tim Berners-Lee
Himself - Interviewed Guest (1 eps)
Laura Waters
Herself - Presenter (1 eps)
Julian Assange
Himself - Interviewed Guest (1 eps)
Robert Smith
Himself (1 eps)
John Hammond
Himself - Presenter (1 eps)
Liz Bonnin
Self - Presenter (1 eps)
Paul McGann
Himself (1 eps)
Toby Jones
Narrator (1 eps)
Danny Wallace
Himself (1 eps)
Fergal Keane
Self - Presenter (1 eps)
Katherine Parkinson
Narrator (1 eps)
Chris Packham
Self (1 eps)
Frank Gillard
Narrator (1 eps)
Terrence Hardiman
Trofim Lysenko (1 eps)
David Swift
Vavilov (1 eps)
Simon Lack
Zhukovskii (1 eps)
Richard Ireson
Prezent (1 eps)
George Cormack
Michurin (1 eps)
Forbes Collins
Iakovlev (1 eps)
Richard Beale
Lysenko's father (1 eps)
Duncan Geddes
Self (1 eps)
Sean Conroy
Self (1 eps)
Peter Middleton
Self (1 eps)
Buckminster Fuller
Self (1 eps)
Robert Horne
Self (1 eps)
Aaron Klug
Self (1 eps)
John Money
Self (1 eps)
David Reimer
Self (1 eps)
Dilly Barlow
Narrator (1 eps)
Ben Carson
Self (1 eps)
Zam Baring
Narrator (1 eps)
Maria Pearson
Self (1 eps)
David Van Horn
Self (1 eps)
Larry Zimmerman
Self (1 eps)
Suzan Harjo
Self (1 eps)
Richard Jantz
Self (1 eps)
Sue Savage-Rumbaugh
Self (1 eps)
Patricia Marks Greenfield
Self (1 eps)
Duane Rumbaugh
Self (1 eps)
Sarah Boyson
Self (1 eps)
Beatrix Gardner
Self (1 eps)
Rayna Green
Self (1 eps)
Ian Holm
Narrator (1 eps)
Tim Ingold
Self (1 eps)
Paul Martin
Self (1 eps)
David Meltzer
Self (1 eps)
David Harris
Self (1 eps)
Abbot Sekaquaptewa
Self (1 eps)
James Hazeldine
Self (1 eps)
Thomas A. Edison
Self (1 eps)
Michael Swann
Narrator (voice) (1 eps)
Francis Crick
Self (1 eps)
James Watson
Self (1 eps)
Vernon Joyner
Narrator (voice) (1 eps)
John Slack
Narrator (voice) (1 eps)
Richard Feynman
Self (1 eps)
Christophe Boesch
Self (1 eps)
Sarah Boysen
Self (1 eps)
Frans de Waal
Self (1 eps)
Jane Goodall
Self (1 eps)
Martin Muller
Self (1 eps)
Crickette Sanz
Self (1 eps)
Robert Sussman
Self (1 eps)
Michael Tomasell
Self (1 eps)
Richard Wrangham
Self (1 eps)
Danny Wallace
Presenter (1 eps)
Jack Fortune
Narrator (voice) (1 eps)
Frank Borman
Self (1 eps)
Dick Gilling
Self - Presenter (1 eps)
Rosemary Leach
Self - Narrator (voice) (1 eps)
Paul Vaughan
Narrator (voice) (1 eps)