In its final season , the series was heard on ABC from October 1949 to July 1950 .
Returning to CBS later that year , Blondie continued there under a new sponsor ( Colgate - Palmolive ) until June 1949 .
In Blondie 's final season , the series was heard on ABC from October 1949 to July 1950 .
Returning to CBS later that year , Blondie continued there under a new sponsor ( Colgate - Palmolive ) until June 1949 .