Nobody's heard of this one. That needs to stop. A bratty kid monster stumbling through the supernatural world is the entire joke, and it lands because the show never strains for laughs, it just lets the kid be insufferable and watches what happens next. The low-key pace means you're not waiting for the punchline. You're living in the annoyed bewilderment of everyone forced to deal with him. This is what comedy looked like before it needed to be loud.
Yadamon is a tiny, mischievous monster with a serious attitude problem. He is a young monster who is spoiled and bratty, and his behavior is the heart of this comedy with a supernatural flavor. Each episode of the 1967 TV series is split into two separate stories, giving viewers a pair of short comic tales about the little monster every time.