Final answer:
The 1940s animated series created by Fleischer Studios that introduced a realistic Art Deco style to the portrayal of a comic book superhero was Superman. It was the first to adapt the comic book character to animation and set the stage for a larger franchise.
Step-by-step explanation:
The animated series created in the early 1940s by Fleischer Studios about a comic book superhero is Superman. This series was notable for its Art Deco style and ultra-realistic look, making it stand out among other animations of the time. The Superman cartoon series was a precursor to a much larger franchise encompassing various forms of media including more animated series, action films, and a plethora of merchandising. These cartoons set a high standard for animation and were some of the first to bring a comic book character to the screen, illustrating Superman's fight against evil with groundbreaking visuals for the era.