The Butterfly Swarm Flutters!

Infamous among anime fans in Japan, this 1974 series by Knack Productions is known for its nonsensical plots, absurdly incompetent animation, and brutal 10-year-old hero. See young Ken Izumi gun down wave after wave of ineffectual aliens, while dealing with misaligned animation cels, repetitive music, and a near total lack of sound effects. The best joke is that none of this was meant as a joke. (imdb)