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In page Doppelgänger (1969 film):

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Martin Anderson compares Doppelgänger to other science-fiction films like Solaris (1972), identifying a "lyrical" tone to the dialogue. However, he concedes that Doppelgänger "doesn't bear comparison with Kubrick or [Solaris director] Tarkovsky."[8] Both commentator Douglas Pratt and the London Institute of Contemporary Arts compare the film to "The Parallel", an episode of The Twilight Zone in which an astronaut returns to Earth to find that his world bizarrely changed and concludes that he has entered a parallel universe.[9][10] Critic S. T. Joshi likens Doppelgänger's theme of duplication to the premise of Invasion of the Body Snatchers, in which a race of extraterrestrials called the "Pod People" kidnap humans and replace them with doppelgangers.[11]