Eduard von Winterstein

as Professor Gesellius

Hanna Ralph

as Maria - Gesellius' Wife

Werner Krauss

as Nung-Tschang

Sybill Morel

as Sin / Magdalena

Friedrich Kühne

as Dr. Armstrong

Conrad Veidt

as Dr. Richard Armstrong Jr.

Alexander Delbosq

as Alí

Sigrid Hohenfels

as The Opium Girl