Others may disagree, but in my opinion anime really starts here:
MIGHTY ATOM aka ASTRO BOY, 1963
I haven’t seen this since it was shown on American shores sometime after its run in Japan, when I was like three or four. It was a shock to revisit it today. So dark by today’s standards for children’s television, so surprisingly funny, violent, and inventive. It’s 26 minutes long. If you’re having a gloomy Saturday, I promise this will brighten your day. And oh man, I can’t wait to show this to my son.