This study seeks to re-examine the trajectory of Islamic radicalism in Afghanistan through an analytical exploration of the ideological and political confrontation between two dominant currents: the traditionalist right-wing radicalism embodied by the Taliban and the left-leaning Islamist revolutionary movements commonly identified as the Mujahideen. While both currents emerged within the broader socio-political upheavals intensified during the Cold War, they represented divergent interpretations of political Islam, state formation, and the relationship between religion and modern governance. The Mujahideen initially mobilized in resistance to the Soviet-backed regime of the People's Democratic Party of Afghanistan, combined Islamist discourse with revolutionary and, in some factions, quasi-leftist organizational structures, reflecting both indigenous reformist impulses and the strategic patronage of external actors such as the United States and Pakistan. In contrast, the Taliban articulated a more rigid, traditionalist, and jurisprudentially conservative project that prioritized the imposition of a centralized Islamic order grounded in a strict interpretation of Sharia. The confrontation between these two radical paradigms was not merely military but epistemological and structural, encompassing competing visions of legitimacy, authority, and social order. By situating this conflict within the interplay of domestic fragmentation and international geopolitical competition, the present study argues that the Afghan experience of Islamic radicalism must be understood as a dynamic and internally contested phenomenon rather than a monolithic ideological project.