I've said it before, and I'll probably say it again a lot in the future(especially in this feature) but damn do these two not make a perfect couple of what?
On one hand you have Neil Gaiman's Sandman, Morpheus, Lord of Dreams,
and on the other, Sleepwalker, alien dream cop.
I smell a buddy cop sitcom/movie.
And if you think about it, just based off main story hooks/motivations, its' really not that much of a stretch to fabricate a reason for these two to team up.
Hell, you can even say Morpheus knows of Sleepwalker and his kind, as he's more than likely their who inspiration for existing. Further more, what if this "alien race of dream cops" was all Morpheus' creation? They could've just forgotten that(like during the 80-year period when Dream was imprisoned) or had their memories wiped by some other sinister force they stumbled across.
either way, you don't need to try too hard to come up with a plausible scenario in which these two meet up.
It sells itself.
As for the antagonist/villain in all this? I don't know, could be anything or anyone really.
Maybe its the maleovelent force eradicating different multiversal versions of Morpheus, maybe it's Dr. Destiny. Who knows. It could jus be someone/something created only for the duration of the team-up.
Who ever it is, it'd have to be powerful enough to keep those two occupied. Maybe it's a team-up between Lucifer and Mephisto, or Mephisto and Dr. Destiny. Again, maybe it doesn't matter as long as its a credible threat that allows this team-up the opportunity to shine.
What say you all? Sound like a fine team-up you'd want to read about?
Who should write it?(Besides the obvious choice) and artist?
Personally, the team of Gaiman and J.H.Williams would more than sell it for me.
Let me know what you think.