This video explores the philosophical concepts of determinism and free will, focusing on the compatibilist view that they can coexist. It uses Harry Frankfurt's thought experiment, known as a Frankfurt case, to challenge the principle of alternative possibilities, which states that for an action to be free, the agent must have been able to do otherwise. The video argues that even if an action was determined, if the mechanism of determination did not intervene, the agent can still be considered free and morally responsible.