Voyage Into Space (1970), a collage of four episodes from the Japanese TV series Johnny Sokko and his Flying Robot, in which a little boy joins a secret organization defending Earth from invaders by turning their own gigantic robot against them, is awful. Awful awful awful. Name a facet, such as special effects or dialog, and it was wretched.
And bad. Even the opposing monsters were bad.
It took a couple of months to get through it.
Don’t you do that, too.