This message was in my YouTube account inbox today:

Some of your “Superfriends” episodes you post are too SCARY for kids. The ones I noticed are “Voodoo Vampire“, “Creature From The Dump“, and “Circus Of Horrors“.
Why don’t you show some less scary ones in the future because kids don’t want to see superheroes turning into monsters?

If those are too scary, please don’t watch the latest two videos I’ve uploaded: