These are beautiful examples of hand drawn animation, essentially film noir adventure stories with great design, rendering and animation; and, as far as I’m concerned, the best film adaptation of the character ever.
The cartoons are in the public domain and have been available on the Internet Archive and YouTube for some time in various versions, but they have been remastered from the original negatives by Warner Brothers and recently released on their YouTube channel for all to enjoy.
All nine of the original series are linked below.
[Links and announcement via Cartoon Brew]
[Please note: the images above are just screen captures, not embedded videos. Use the links below.]