Leo McKern

as Galileo

Nigel Stock

as Narrator / Sagredo / Cardinal Bellarmin / Pamphleteer / Peasant

Fergus McClelland

as Andrea, the boy

Rosalie Crutchley

as Mrs. Sarti

George Roubicek

as Ludovico

Anthony Morton

as Priuli, the Curator

Paul Endersby

as The Doge / Christopher Clavius

Sheila Shand Gibbs

as Virginia

Martin Sterndale

as Matti

Michael Peake

as Senator

Darryl Read

as Prince Cosimo de Medici

Vernon Dobtcheff

as Philosopher