Robert Downey Jr. Calls Cillian Murphy's Oppenheimer Transformation BANANAS (Exclusive)
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Robert Downey Jr. gushes to ET's Will Marfuggi about costar Cillian Murphy's transformation into J. Robert Oppenheimer for their upcoming film, 'Oppenheimer,' a biopic about the man credited with creating the atomic bomb. 'Oppenheimer,' in theaters on July 21.