This chapter discusses how returnees from al Mustafa International University, including those from the International Centre for Islamic Studies, its preceding institution, have played a significant role in the development of the Shi'i community in Sunni dominated Indonesia. Pursuing Islamic education at Qom is a post-1979 phenomenon made popular by al Habsyi, an Indonesian scholar of Arab descent, who gained the trust of religious leaders in the Islamic Republic of Iran. Following a detailed account of the educational background of Indonesian students who went to Qom, the chapter illustrates the activities of the graduates in their home towns, such as their creation of the Association of al Mustafa International University Alumni, missionary activities through various Shi'i institutions, and educational activities in religious schools, including the Islamic College Jakarta, a branch of the university.