This article takes mission in a broad sense; the involvement of overseas Christianity in and its influence on local Christianity. Moreover this article is not a contribution to any particular contemporary missiological debate; it is an empirical study of significant novel realities in Kenyan Christianity, and arose from a year's field research in that country, October 2005 to September 2006. Given its pre-eminent position on the continent, Nairobi is home to numerous mission organisations. More groups seem continually moving in. Their presence is increasingly obvious. It is the nature of this presence and its effects that we examine here.