While a great deal of social science literature has examined the explosion of pentecostal and charismatic Christianity in the Global South as well as conservative and anti-modern forms of resurgent Christianity in the United States, little work has been done to investigate the causal effects of the former on the latter. Drawing from existing literature, interviews, and archives, this article contributes to filling that gap by arguing that in the mid-twentieth century, evangelical missionary concerns about competition from global Pentecostalism led to an intellectual crisis at the Fuller School of World Missions; this crisis in turn influenced important Third Wave figures such as John Wimber and C. Peter Wagner and is linked to key moments and developments in their thought and pedagogy. While a great deal of social science literature has examined the explosion of pentecostal and charismatic Christianity in the Global South as well as conservative and anti-modern forms of resurgent Christianity in the United States, little work has been done to investigate the causal effects of the former on the latter. Drawing from existing literature, interviews, and archives, this article contributes to filling that gap by arguing that in the mid-twentieth century, evangelical missionary concerns about competition from global Pentecostalism led to an intellectual crisis at the Fuller School of World Missions; this crisis in turn influenced important Third Wave figures such as John Wimber and C. Peter Wagner and is linked to key moments and developments in their thought and pedagogy.