Horizon

Michael Mosley

Self

Paul Vaughan

Narrator (voice)

Alice Roberts

Self - Presenter

Hannah Fry

Self - Presenter

Richard Feynman

Self

Brian Cox

Presenter

Giles Yeo

Presenter

Xand van Tulleken

Presenter

David Attenborough

Self

Steven Mackintosh

Himself - Narrator

Kevin Fong

Self - Presenter

Michio Kaku

Kelly Hunter

Herself - Narrator

Helen McCrory

Narrator

Chris van Tulleken

Presenter

Helen Czerski

Self - Presenter

Iain Stewart

Self - Presenter

Jim Al-Khalili

Self - Presenter

David Lutyens

Self - Reporter

Dilly Barlow

Narrator

Jack Fortune

Narrator

Richard Branson

Nicholas Soames

Bob Brier

Robert Winston

Robert Gallo

Trevor R. Bryce

Joshua Wurman

Bill Paterson

Lori Schappell

Gary England

Reba Schappell

Andrew Scott

Narrator

Rupert Penry-Jones

Himself - Narrator

Adrian Lester

Himself - Narrator

Dr Adam Rutherford

Presenter

Hugo Speer

Narrator

Gabriel Weston

Presenter

David Harewood

Narrator

John Hannah

Himself - Narrator