Horizon

Richard Branson

Nicholas Soames

Robert Winston

Robert Gallo

Bill Paterson

Michio Kaku

Kelly Hunter

Herself - Narrator

Andrew Scott

Narrator

Helen McCrory

Narrator

Rupert Penry-Jones

Himself - Narrator

Adrian Lester

Himself - Narrator

Dr Adam Rutherford

Presenter

Hugo Speer

Narrator

David Harewood

Narrator

John Hannah

Himself - Narrator

Giles Yeo

Presenter

Adam Pearson

Presenter

Chris van Tulleken

Presenter

Daniel Kahneman

Presenter

Xand van Tulleken

Presenter, Self - Presenter

Tim Berners-Lee

Himself - Interviewed Guest

Alice Roberts

Self - Presenter

Julian Assange

Himself - Interviewed Guest

Michael Mosley

Self - Presenter, Self, Narrator

John Hammond

Self - Presenter

David Attenborough

Self, Himself / Narrator

Helen Czerski

Self - Presenter

Iain Stewart

Self - Presenter

Liz Bonnin

Self - Presenter

Hannah Fry

Self - Presenter, Self

Paul McGann

Himself

Toby Jones

Narrator

Danny Wallace

Himself

Fergal Keane

Self - Presenter

Katherine Parkinson

Narrator

Chris Packham

Self

Steven Mackintosh

Himself - Narrator, Narrator

Arthur C. Clarke

Terrence Hardiman

Trofim Lysenko

Kevin Fong

Presenter, Self - Presenter

Buckminster Fuller

Self

Zam Baring

Narrator

Richard Feynman

Himself, Self

Ian Holm

Narrator

James Hazeldine

Self

Thomas A. Edison

Self

James Watson

Self

Jane Goodall

Self

Frank Borman

Self

Rosemary Leach

Self - Narrator (voice)

Paul Vaughan

Narrator (voice)

Lucian Msamati

Narrator

Jack Fortune

Narrator (voice), Narrator

Brian Cox

Personter, Presenter

Bernard Hill

Narrator

Jemma Redgrave

Narrator (voice)

Saul Perlmutter

Self - Lawrence Berkeley Lab

Adam Riess

Self - University of California, Berkeley

Stephen Hawking

Himself