Miss Walsh was Miles’s and Gabi's kindergarten teacher, as seen in flashbacks from a 2006 episode of Sesame Street. A gentle and lively woman, Miss Walsh leads her young students in a rhythmic performance of "The Alphabet Song," encourages a shy Miles, and emphasizes the importance of sharing.

Lillias White, who played Miss Walsh, had previously appeared on Sesame Street as Lillian, from 1989 through 1993.