The National Science Foundation (NSF) has funded a number of informal STEM programs that provide funding for media producers, including public television (TV) stations, to provide children’s STEM programming in out-of-school-time (OST) settings. These projects typically include a children's TV series (animated or not) aired on the Public Broadcasting Service (PBS), plus resources such as hands-on activity guides, educator toolkits, and other materials that can be used to support STEM learning in OST settings. This paper explores the lessons learned from seven such programs and their respective