Michael Brandon

Arno Penzias

Adam Godley

Frank Hawking

John Sessions

Dennis Sciama

Matthew Marsh

Dr. John Holloway

Benedict Cumberbatch

Stephen Hawking

Alice Eve

Martha Guthrie

Phoebe Nicholls

Isobel Hawking

Peter Firth

Sir Fred Hoyle

Tom Ward

Roger Penrose

Lisa Dillon

Jane Wilde

Tom Hodgkins

Robert Wilson

Anastasia Hille

Nurse Susan McClean

Christian Rubeck

Reporter

Bertie Carvel

George Ellis

Carolina Giammetta

Lidia Sciama

Sebastian Armesto

Robert Silkin

Rohan Siva

Jayant Narlikar

Deirdre Costello

Barmaid

Linda Spurrier

Train Passenger

Anthony Howell

Hamlet

Che Cartwright

Guildenstern

Leon Ockenden

Rosencrantz

James Warrior

Cab Driver

David McKail

Frink

Philip Martin

Director

John Lynch

Executive Producer

Laura Mackie

Executive Producer

Peter Moffat

Writer