To celebrate, Boomerang will be airing the first episode, "The Flintstone Flyer," tonight (simultaneously nationwide!) .. 8:30 PM EDT (5:30 PM PDT). Two other episodes -- "The Hot Piano" (the 'Happy Anniversary!' show) and "Dress Rehearsal" (featuring the birth of Pebbles) will also be shown, followed by an airing of their first theatrical film, The Man Called Flintstone.
There will also be a 24-hour Flintstones marathon on Boomerang all-day Saturday, October 2nd.
Happy 50th Anniversary to Fred, Wilma, Barney & Betty!