Mark McDermottKnown forActingCredits3 acting creditsKnown ForA Family Circus Christmas18 Dec 1979A Special Valentine with the Family Circus10 Feb 1978A Family Circus Easter07 Apr 1982Filmography1982A Family Circus Easteras Billy (voice)1979A Family Circus Christmasas Billy1978A Special Valentine with the Family Circusas Billy (voice)