Mark McDermottActingShareKnown forAdd4.9A Family Circus Christmas1979 · BillyAdd8.5A Family Circus Easter1982 · Billy (voice)Add6.0A Special Valentine with the Family Circus1978 · Billy (voice)YearPopularTop ratedAll acting creditsAdd8.5A Family Circus Easter1982 · Billy (voice)Add4.9A Family Circus Christmas1979 · BillyAdd6.0A Special Valentine with the Family Circus1978 · Billy (voice)
