Don’t get me wrong—this year’s Pacific Rim is great special-effects fun. But nothing in even the best computer-generated monster movie can come close to the glory of a special effect crafted by the late, great Ray Harryhausen. Two of his stop-motion creature features—The 7th Voyage of Sinbad and Jason and the Argonauts—are showing all week long at the Grand Illusion, and tonight’s double feature of two mystery Harryhausen flicks will send literal shivers down your literal spine. CGI looks lighter than air in comparison to Harryhausen’s skeleton armies, vicious dinosaurs, and giant octopuses. (Grand Illusion Cinema, 1403 NE 50th St, grandillusioncinema.org, 7 and 9 pm, $8–$12)