A children's hosted circus show aired on WDCA-TV Channel 20, Washington D . C., Mondays to Fridays, at various air times, from 30 August 1971 to 1972 with John Alexi as host "Bozo, the World's Most Famous Clown" , then from 1972 until 19 August 1977, when Dick Dyszel replaced Alexi as the popular "Bozo, the World's Most Famous Clown" .