Tonton Streaming W.I.T.C.H. (2004) S1E5 - A Service to the Community

While helping out in Community Service Day, Will and Hay Lin find a strange Meridian graffiti which The Mage identifies as belonging to a Beast, living in Heatherfield in human form. Will suspects her History teacher, Professor Collins, and the girls immediately formulate a plot to force the suspected monster into revealing his true form.