The Sea Serpent

Timothy Bottoms

Pedro Fontán

Taryn Power

Margaret

Jared Martin

First Mate Lemaris

Ray Milland

Professor Timothy Wallace

Gérard Tichy

Carole James

Jill

Jack Taylor

Hospital Killer

León Klimovsky

Dr. Moore

Charly Bravo

Víctor Israel

Porto, Night Watchman

Pilar Alcón

Nurse (as Diana Eagle)

José Canalejas

Eduardo Bea

Teresa del Olmo

Alicia González

José Yepes

Jorge Bosso

Beatriz Savón

José Bastida

Barta Barri

Defensor

Paco Catalá

Fabián Conde

Alfonso de la Vega

Alfredo Enríquez

José Ramón Pardo

Luís Zagalo