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William Shatner’s narration and the Moscow Symphony Orchestra’s score help convey the power of atomic fission in Trinity and Beyond, Peter Kuran’s documentary about the development of nuclear weapons. The director worked for three years assembling this film, and managed to attain much previously unavailable (and sometimes long-secret) footage. At 8:30 p.m. Sunday at the Kennedy Center’s American Film Institute Theater. $6.50. (202) 785-4600. (Mark Jenkins)