 Aired from 12 September 1966 to 9 September 1968 on NBC for 58  episodes. It ruled its NBC primetime slot (Mondays 7:30) for the  entire duration of its run. CBS carried repeats of the series on its  Saturday Morning schedule between 13 September 1969 and 2 September  1972; after which, it was seen for a season on the ABC Saturday  Morning schedule from 9 September 1972 to 1 September 1973.