With Fitzmaurice portraying team leader Blackhawk , the series premiered September 13 , 1950 .
With Fitzmaurice portraying team leader Blackhawk , the series concluded a few months later on December 27 , 1950 .
With Fitzmaurice portraying team leader Blackhawk , the series premiered September 13 , 1950 and concluded a few months later on December 27 , 1950 .