October 8 offers a look at the eruption of antisemitism on college campuses, social media, and in the streets of America beginning the day after the October 7th attack on Israel by Hamas. Through meticulous investigation, the film also uncovers how over decades, Hamas created sophisticated networks in America to permeate U.S. institutions and examines the tsunami of online antisemitism, propaganda, and disinformation unleashed by Iran, China, and Russia—with the sole purpose of dividing American society.