Leo McKern

Character: Galileo

Nigel Stock

Character: Narrator / Sagredo / Cardinal Bellarmin / Pamphleteer / Peasant

Fergus McClelland

Character: Andrea, the boy

Rosalie Crutchley

Character: Mrs. Sarti

George Roubicek

Character: Ludovico

Anthony Morton

Character: Priuli, the Curator

Paul Endersby

Character: The Doge / Christopher Clavius

Sheila Shand Gibbs

Character: Virginia

Martin Sterndale

Character: Matti

Michael Peake

Character: Senator

Darryl Read

Character: Prince Cosimo de Medici

Vernon Dobtcheff

Character: Philosopher