MMark McDermottActingPopularity: 0Known For4.9A Family Circus ChristmasBilly6.0A Special Valentine with the Family CircusBilly (voice)8.5A Family Circus EasterBilly (voice)FilmographyMovies3TV Shows0AllCast3CrewBrowse All1980s8.5A Family Circus EasterBilly (voice)1970s4.9A Family Circus ChristmasBilly6.0A Special Valentine with the Family CircusBilly (voice)