In 1926, the 22-year-old doctoral student J. Robert Oppenheimer grapples with anxiety and homesickness while studying experimental quantum physics under Patrick Blackett at the University of Cambridge in England. Oppenheimer clashes with Blackett and leaves him a poisoned apple but later retrieves it. Visiting scientist Niels Bohr advises Oppenheimer to study theoretical physics at the University of Göttingen in Germany.