There's the Fake solicitations game, but this is a much more flexible concept.
You can be as elaborate as you want, but all that is needed is a line. For instance:
I can include a list of characters, plot synopsis, setting etc.
The big idea is to have a free outlet for creativity in which we can see cool concepts. For instance:
*Detective Chimp and Enchantress team-up to find Solomon Grundy, but when they find something much greater and older than they expected, only Dr. Fate can help them.