John Harrison
Michael Gambon
Rupert Gould
Jeremy Irons
William Harrison (Adult)
Ian Hart
John Campbell
Andrew Scott
Muriel Gould
Anna Chancellor
Nevil Maskelyne
Samuel West
Admiral Cloudisley
Jonathan Coy
Alec McCowen
Lord Sandwich
Bill Nighy
Elizabeth Harrison
Gemma Jones
Sir Edmund Halley
John Wood
Sir Kenhelm Digby
Stephen Fry
Lord Morton
Brian Cox
Grace
Lucy Akhurst
Dodo Gould
Barbara Leigh-Hunt
King George
Nicholas Rowe
George Graham
Peter Vaughan
Dr. Bliss
Ian McNeice
Army Doctor
Peter Cartwright
Capt. Ainsley
Christopher Hodsol
William Harrison (Young)
Liam Jennings
Rebecca Clay
Waddington
Michael Cochrane
Sir Charles Pelham
Nigel Davenport
Christopher Irwin
Tim McInnerny
Roger Wills
Trevor Cooper
Capt. Proctor
John Standing
Sarah Badel
James Bradshaw
John Jefferies
Peter Hugo Daly
Capt. Bourke
Daragh O'Malley
Lt. Draper
Cliff Parisi
Robert Demeger
Phil Dix
Lt. Seward
Charles Edwards
Halley's Secretary
Tobias Menzies
Frank Finlay
Capt. Lindsay
Pip Torrens
Clive Francis
Alfred Burke
Edmund Burke
T. P. McKenna
Charles Gray
Sasha Hails
Mr. Greene
John Normington
Capt. Man
Roger Lloyd Pack
Surgeon
Peter Penry-Jones