Oh, what a fine line between adorably grody little aliens whose phone-home request only the heartless would deny and malevolent space horrors best left on call-waiting forever. We get a little of both this week with the hi-def debut of “E.T. The Extra-Terrestrial” (1982) and the 3-D Blu-ray release of Ridley Scott’s “Alien” quasi-prequel, “Prometheus” (2012).
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