When educators do not facilitate English language learners' (ELLs) social integration in schools, this can perpetuate ELLs' marginalized status and the plateauing of ELLs' English language development. This study highlights a program for secondary ELLs called the ELL Ambassadors program, which partnered ELLs with non-ELLs based on shared extracurricular interests. Comparing the stories, perspectives, and test scores of five newcomer ELLs from varied countries of origin, this article shows how program participants strengthened their English language skills and achieved academic success, demonstrating tremendous agency as they gained access to, and were socialized within, interest-based communities of practice. Further, this article documents how youth imagined and claimed new identities, moving beyond the insulation and isolation of the ESL bubble to gaining confidence through interest-based learning with other peers. Findings suggest that interest-based peer programs at schools may create important opportunities for ELLs' academic, language, and identity formation.