Donovan

The Pied Piper

Diana Dors

Frau Poppendick

Donald Pleasence

The Baron

Roy Kinnear

Burgermeister Poppendick

John Hurt

Franz

Michael Hordern

Melius, Alchemist

Jack Wild

Gavin

Peter Vaughan

Bishop

Keith Buckley

Mattio

Cathryn Harrison

Lisa

Peter Eyre

Pilgrim

David Leland

Officer

Patsy Puttnam

Helga

Arthur Hewlett

Otto

André van Gyseghem

Friar

John Welsh

Chancellor

David Nettheim

Kulik (as David Netheim)

Hamilton Dyce

Papal Nuncio

Roger Hammond

Burger

Mary MacLeod

Maidservant (as Mary McLeod)