Pedro Calungsod, a young Filipino man, leaves his Visayan native roots to join the Spanish Jesuit priest Fr. Diego de San Vitores in his mission to the Marianas Islands (Guam) in 1668. The San Diego Mission arrives in the Marianas where the young Pedro, a trained catechist and mission assistant, begins work for Fr. Diego de San Vitores in baptizing the Chamorro natives, preaching the holy gospel and spreading the good news of salvation through the Christian faith amidst paganism, doubt and disbelief. Despite the longing for his father and the threats to their lives, even at the peril of death, Pedro and Fr. Diego continued their missionary work. They roamed the dangerous islands and baptized many more natives and continued to enlighten them about Christianity.