Episode 4 of the documentary series "MAD World - The History of the Cold War" is titled "Nuclear Poker." This episode explores the tense and dangerous game of nuclear brinkmanship played by the superpowers during the Cold War. It delves into the strategies, technologies, and events that shaped this high-stakes game, highlighting key moments such as the Cuban Missile Crisis. The episode provides an in-depth look at how the nuclear arms race between the United States and Soviet Union brought the world to the edge of destruction.