- The episode focuses on the lead up to World War 2 in the Pacific theater, particularly looking at Japan's rise as an imperial power. - It provides background on Japanese history and culture, including the Tokugawa shogunate period, the Meiji Restoration, and the influence of Bushido warrior ethics. - Japan goes from an isolated, feudal society to rapidly modernizing and building up its military in the late 19th century. This sets the stage for Japan's wars with China and Russia. - After annexing Korea and Taiwan, Japan looks to expand further into Manchuria in mainland China in the 1930s. This leads to the Mukden Incident in 1931, which sparks the undeclared war between Japan and China. - Meanwhile, political assassinations and attempted coups by right-wing nationalist groups create instability in Japan. The military increasingly asserts control over the weak civilian government. - In 1937, full scale war erupts between Japan and China after the Marco Polo Bridge Incident near Beijing. The fighting spreads to Shanghai, resulting in high casualties on both sides over a three month battle. - The episode ends with the Japanese capture of Nanjing, setting the stage for the infamous Nanjing Massacre that will be covered in the next part. In summary, the episode provides important historical context about Japan's cultural and political development that led to its imperial expansionism and eventual war with China in the lead up to World War 2.