Leo McKern
(Galileo)
Nigel Stock
(Narrator / Sagredo / Cardinal Bellarmin / Pamphleteer / Peasant)
Fergus McClelland
(Andrea, the boy)
Rosalie Crutchley
(Mrs. Sarti)
George Roubicek
(Ludovico)
Anthony Morton
(Priuli, the Curator)
Paul Endersby
(The Doge / Christopher Clavius)
Sheila Shand Gibbs
(Virginia)
Martin Sterndale
(Matti)
Michael Peake
(Senator)
Darryl Read
(Prince Cosimo de Medici)
Vernon Dobtcheff
(Philosopher)