I really wanted this to be the Living Nightmare from Astro City, that the doctor was trying to cure himself of fear by externalizing it only to release a monster when fear, unchecked and concretized, went berserk. Instead, just a brain jellyfish. Which is fine! But not what I wanted it to be.
I love how these old stories are just so *confident* about the complete nonsense science they feature. Just straight up "oh yeah black lights keep psychic effects out" and no questions asked nor answers given. XD