It originally aired from November 19, 1959, to June 27, 1964, on the ABC and NBC television networks. Produced by Jay Ward Productions, the series is structured as a variety show, with the main feature being the serialized adventures of the two title characters, the anthropomorphic moose Bullwinkle and flying squirrel Rocky. The main adversaries in most of their adventures are the Russian-like spies Boris Badenov and Natasha Fatale.