In 1968, a wonderful animated film was released, Yellow Submarine. Watch it here.
I'm not sure how the movie can be posted on the Internet, so enjoy it while it lasts.

The movie took two years to create and it came out at the height of the psychedelic era. Perfect timing, because the movie is psychedelic, yet timeless. The movie makers used Beatles songs from 1965-67 to outline the plot, and the 1967 version of the animated Beatles star in the film. As Wikipedia tells us,

As with most motion picture musicals, the music takes precedence over the actual plot, and most of the story is a series of set-pieces designed to present Beatles music set to various images, in a form reminiscent of Walt Disney's Fantasia (and foreshadowing the rise of music videos and MTV fifteen years later). Nonetheless, the movie still presents an entertaining modern-day fairy tale that caters to the ideals of the "love generation".

. . .

The movie's style contrasts greatly with the efforts of The Walt Disney Company and other animated films previously released by Hollywood up until the time. The film uses a style of limited animation that deliberately defies reality and paints a landscape that could never exist in the real world; something that appealed greatly to the escapists of the 1960s.

Roger Ebert loves the movie. The Beatles were not involved in producing Yellow Submarine (the British voices in the film are not theirs), but they warmed up to it and made a cameo appearance at the end. Watch the movie here.