Teen Science Cafés are Out-of-School Time (OST) programs led by teens--for teens--underway at 84 sites in 34 states. Supported by a national network, a new teen leadership opportunity offered youth-focused training and collaborative opportunities to a cohort of 50 teens from 13 Café sites with the goal of sustaining and expanding the impact of Teen Science Cafés across local communities. Findings from the evaluation of the 2024 cohort indicate success at increasing the level of youth ownership of Café events and value in elevating the voice of teens in setting the trajectory for their Teen Science Café programs. A vast body of research affirms the value of OST programming, and layering quality STEM learning provides youth with opportunities to cultivate an interest in STEM, build relevant skills, and explore pathways toward in demand STEM careers. Teen Science Cafés are a long-standing teen program that has been proven to positively influence participants' attitudes toward science, including interest in science and science careers. The new Teen Catalyst program enhances that impact of regional Cafés while elevating youth leadership and ownership over their community's Teen Science Café. Details about the Teen Catalyst program and outcomes from the first year are shared.