Watch The New Adventures of Huckleberry Finn (1968-1969) full episodes.
Synopsis: Huckleberry Finn and his friends, Tom Sawyer and Becky Thatcher, travel from one animated world to the next, always followed by the same villain, Injun Joe. The gimmick is that Huck, Tom, and Becky are live action characters and everything else is animated.
Stars: Michael Shea, Lu Ann Haslam, Kevin Schultz
More information: IMDB, Wikipedia