Okay this is a weird one, I believe it may be an after school special but some boy gets locked in his room without dinner and as he’s crying on his bed three elves?? who look a lot like snap crackle and pop from the rice krispies cereal commercials visit him and take him to an amusement park for the day

Old black and white movie on TV. Some guy in a suit tell the others he’s the only way to defeat the evil and climbs a construction crane gets out on the edge of it and swings it through the flaming head of the devil in the sky which then explodes and disappears He killed himself to save everyone