d) “Huckleberry Hound”

“Huckleberry Hound,” debuting in 1958, was the first American animated television series. Created by William Hanna and Joseph Barbera, the show featured a blue dog named Huckleberry Hound whose laid-back and good-natured personality won over audiences. Each episode included comedic adventures in various settings, with Huckleberry often finding himself in humorous situations. The success of “Huckleberry Hound” paved the way for future animated series on television, establishing Hanna-Barbera as a significant force in the animation industry.