A psycho-physiologist experiments with drugs and a sensory-deprivation tank and has visions he believes are genetic memories.
A look at, analysis and review of Altered States directed by Ken Russell
Contains some disturbing imagery.
Timestamps:
Intro / Analysis (Somewhat spoiler free) 00:00
Review (SPOILERS) 11:56
Copyright Notice
Video used for review purposes and I claim exemption under section 107 of the Copyright Act