Frankly, I don't think television is good for kids. Period. They run so many images across the screen these days, so rapidly, and then they interrupt your train of thought with ads, which run really HUGE numbers of images across the screen even more rapidly, then --zoom -- back to the show . . . more images . . .
I think TV contributes to ADHD, where kids can't concentrate on any one thing for very long -- because it programs them for interruptions in their train of thought.
That's my bias. If you are watching stuff on TV that is scary, your child is going to respond. Remember that even if the "image" isn't scary, the music, the voices, all of that combine together to create an emotional pitch, and even without the image to look at, it's scary as hell for a child. Even Disney movies are scary to young children.
Let me ask you this: What makes you think a child would NOT get scared by something on TV ? Children are very vulnerable, and they don't differentiate between what's on TV and what is real. It is most likely TWICE as scary to a child.
My advice? Turn it off when your child is awake. Give your child the opportunity to create his own entertainment, play with him, build things with blocks or legos, do puzzles, read books, take walks, go swimming, explore the world in person. There's plenty of time later for TV, but give him the opportunity and freedom to let his brain develop without using TV shows -- if you must, use good quality children's movies, that don't get interrupted with a kazzillion ads. Let him actually watch the story progress, rather than watch something that is constantly interrupted and be barraged with media hype the advertisers want children to see and respond to.