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In page Doppelgänger (1969 film):

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A retrospective published on the website IGN argues that the presentation of politics and economics in Doppelgänger goes against the conventions of 1960s science fiction.[3] This is reflected in UFO, whose characters "were constantly having to deal with the pressures of having to show progress under the scrutiny of accountants and elected officials, much the same way NASA was starting to in the US."[3] On the links between Doppelgänger and UFO, Martin Anderson makes another connection to director Stanley Kubrick: "... the most interesting common ground between the two projects remains the bleak ending(s) and the slight flirtation with the acid-induced imagery and mind fucks of 2001."[8]