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Michael Gambon
John Harrison

Jeremy Irons
Rupert Gould

Gemma Jones
Elizabeth Harrison

Anna Chancellor
Muriel Gould

Stephen Fry
Sir Kenhelm Digby

Emma Kay
Laura Gurney

Barbara Leigh-Hunt
Dodo Gould

Peter-Hugo Daly
John Jefferies

Gary Waldhorn
Commodore Forrest

Tim McInnerny
Christopher Irwin

Roger Lloyd Pack
Capt. Man

Tobias Menzies
Halley's Secretary (uncredited)

Frank Finlay
Admiral Wagner

Charles Gray
Admiral Balchen

Alec McCowen
Sir Frank Dyson

Andrew Scott
John Campbell