This looks like it was inspired by of "For the Man who has everything"; a Superman comic about a plant which feeds the victim a life-like illusion of the victim's greatest desires and feeds off the victim's lifeforce. Meanwhile, one of Superman's villains is attacking Batman, Wonder Woman, and Robin. Although the dream takes a dark turn, for a while, it is a dream come true, in which Krypton was never destroyed. The villain is beaten when the plant is tossed back on him, and we get to see what he wants: universal conquest.

They made that into a Justice League Unlimited episode.

Makes me wonder if we will see Xykon and Redcloak's versions of their happy endings too.

Here: http://en.wikipedia.org/wiki/For_the...Has_Everything