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There, Loki tricks Malekith into drawing the Aether out of Foster, but Thor's attempt to destroy the exposed substance fails. Malekith merges with the Aether and leaves in his ship as Loki is fatally wounded while killing Algrim. Thor, cradling Loki in his arms, promises to tell their father of his sacrifice. Afterward, Thor and Foster discover another portal in a nearby cave and reunite in London with Lewis and Foster's mentor Dr. Erik Selvig—who was briefly institutionalized due to the mental trauma he suffered during Loki's attack on Earth. They learn that Malekith plans to restore the Dark Elves to dominance by unleashing the Aether at the center of the Convergence in Greenwich. Thor battles Malekith through various portals and across multiple worlds until one portal separates them, leaving Malekith unopposed on Earth. Thor returns in time to help his mortal comrades use their scientific equipment to transport Malekith to Svartalfheim, where he is crushed by his own damaged ship.