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Special-effects legend Ray Harryhausen crafts campy creepy-crawlies and marauding saucer men with an imagination unmatched in modern cinema. From the famous skeleton swordfight of Jason and the Argonauts to the expressive apes, centaurs, snake ladies, and Gorgons of Clash of the Titans and the Sinbad series, Harryhausen’s stop-motion masterworks quiver with an otherworldly weirdness that leaves CGI feeling DOA. Making masterful use of miniature models, multiple images, and in-camera optical trickery, Harryhausen’s work is less animation than—as he likes to call it—“kinetic sculpture.” It might be fitting, then, that the Hirshhorn Museum and Sculpture Garden has chosen three B-grade, atomic-age Harryhausen classics for this year’s “Summer Camp” series, kicking off with 1955’s It Came From Beneath the Sea (at 7 p.m. Thursday, June 5), the age-old tale of an irradiated octopus that puts the squeeze on San Francisco. In addition to marking the beginning of the film fest, It Came From Beneath the Sea also happens to be the first film in Harryhausen’s longtime collaboration with producer Charles H. Schneer. In fact, all of the “Summer Camp” films are Schneerhausen joints: The pair partnered on 20 Million Miles to Earth (at 7 p.m. Thursday, June 12), about an alien hatchling that bulks up and sacks Rome, as well as the cult favorite Earth vs. the Flying Saucers (at 6 p.m. Sunday, June 29). Film scholar David Wilt introduces each movie in the series, which runs through Sunday, June 29, at the Hirshhorn Museum and Sculpture Garden’s Ring Auditorium, 7th St. & Independence Ave. SW. Free. (202) 633-1000.