The Bookworm - S1.E12

Easy Reader (Morgan Freeman) is helping his girlfriend, Valerie (Hattie Winston) sort books at the library, when they notice large holes in the books. They try to beat back a large bookworm (a purple and green-striped sock-puppet) by throwing books at it. Spidey arrives in time, but the Bookworm escapes his web. The opening screenshot shows Spidey attempting to stop the Bookworm from eating a book.