That could just be a testament to the crown prolonging his life though, it doesn't explicitly mean the crown can only affect one at a time.

Perhaps the effects happening very quickly are human exclusive.

But Ice King went crazy with prolonged crown use. Just slipping it on for a very small amount of time isn't going to really do anything.

That's how I felt when seeing APTWE listen to all the other creatures. It gave more of a "you can try, but you can never truly escape your destiny," vibe.

Spot on review and summed up a lot of how I felt as well. I did feel with the scope of the whole thing that it could have worked better as a half hour special, but still what we get in just one single episode was still worthwhile and pretty damn awesome. I love the potential setups this episode leaves us with.