I love this story too, although you left one of my favorite parts, when Dream Girl orders Brainiac and the others to keep the servants of darkness off the Teachers' Isle at all costs, and Brainy just promises to hold or die.
I also love moment when Dream Girl sounds the alarum bell to summon up the replacements, the reserves, the resignees, everybody.
But yeah, this was a great story. Some of the bits with Light Lass and Shrinking Violet are kind of amusing when you consider what happened with them later. Anyway, thanks for posting this.