This dissertation explored the literacy practices that developed around comics when two secondary teachers (one AP Science and one AP English) used comics in their classroom instruction for the first time. It also explored the ways the teachers and their students positioned comics within their specific classroom contexts. Historically, comics are a marginalized medium in educational circles---widely considered non-academic despite the recognition by scholars for their sophistication as a multimodal medium. Scholars, librarians, teachers, and comics authors have made the case for the inclusion of comics in educational contexts citing their ability to support the literacy development of struggling readers, engage reluctant readers, promote lifelong reading, and convey information visually. However, the roles comics can play in educational contexts are still under researched, and many gaps exist in the literature including a lack of real world contexts and clearly reported instructional strategies. This study aimed to fill these gaps by reporting the literacy practices that students and teachers develop around comics, as well as contextualizing these practices in the classroom contexts and students' and teachers' experiences. Drawing from a social semiotic view of multimodality and the view of literacy as a social practice, I conducted a qualitative case study using ethnographic methods for data collection which I analyzed using an interpretive framework for qualitative data analysis and constant comparative analysis. I found three literacy practices developed around comics in these contexts---Q&A, writing about comics, and drawing comics. I also found that teachers and students positioned comics in four primary ways within these contexts---as a tool, as entertainment, as a medium, and as a traditional form of literature. Based on my findings, I developed three assertions: 1) there is a disconnect between teachers' goals for using comics in their instruction and the literacy practice that developed around the comics they selected; 2) there is a disconnect between the ways in which teachers position comics and the ways in which students position comics; and 3) traditional views of literature and literacy continue to dominate classrooms when multimodal texts are selected and utilized during instruction.