Despite a growing awareness among teachers of the importance of recognizing and valuing a broader range of students' literate resources and experiences, including those that are culturally and linguistically linked, in many language arts classrooms students' literacy practices continue to be marginalized--remaining peripheral to, if not at odds with, the central work of the classroom. This ethnographic study, featuring a sixth-grade African American girl, examined one such case of marginalization that occurred in an urban English language arts classroom during an integrated novel study unit. Drawing on the Bakhtinian concept of dialogism, the study considers how a student-authored play showcasing cultural and linguistic resources disrupted the planned curriculum and how tensions were negotiated by the teacher, student, and researcher. In spite of the student's efforts and the teacher's best intentions, hegemonic centripetal forces resisted and ultimately marginalized students' literate interests and agendas in this classroom. Recommendations from this research include planning on, and for, dialogism by deliberately structuring curricula so there is both time and space for students' literate interests, resources, and abilities. (Contains 1 note.)