After D-Day on June 6, 1944, the global race is already underway to build the first atomic bomb. In this episode, we explore the efforts happening in complete secrecy to stop Nazis from doing it first.   

Operation Blue: The German army fights to take Soviet oil fields and the city of Stalingrad, becoming one of the deadliest battles ever fought and a major turning point on the Eastern Front.  

Behind the fierce front-line clashes of World War II, a hidden battle rages—one of espionage, deception, and codebreaking. In rural England, a group of brilliant academics work to crack Germany's "unbreakable" Enigma code and change the course of the war.  

In Operation Torch, the first joint US–British offensive of the war, thousands of inexperienced American troops—and their untested leader Eisenhower—face off against the hardened German Afrika Korps and infamous Field Marshal Erwin Rommel. 

After the attack on Pearl Harbor, Japanese forces sweep across Southeast Asia. On Guadalcanal, US Marines are given the bloody task of stopping their relentless advance.