"Oppenheimer" with Cillian Murphy as lead role stars in Christopher Nolan's WWII atomic bomb movie

Cillian Murphy was surprised when Christopher Nolan asked him to lead in his new film "Oppenheimer"
Murphy has been a regular presence in Nolan's films for almost two decades
Murphy first met Nolan in 2003 when he screen tested for Batman
"Oppenheimer" is a film about the theoretical physicist who helped create the atomic bomb
The film features a starry cast including Emily Blunt, Matt Damon, Robert Downey Jr., and Gary Oldman