Former vaudeville impersonator and lab assistant who murders Dr. Meirschultz, impersonates him, and takes over his experiments. He accidentally causes a patient's violent breakdown, manipulates women into fighting, and gradually descends into insanity.
The neighbor becomes an unwitting witness to Don's escalating chaos.
Don and Alice are legally married but separated, with a strained history.
Don operates as Buckley's physician while hiding his true identity.
Don serves as the scientific assistant to the mad doctor before their relationship turns fatal.
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