Who Was That Blue Guy?

There was a pretty cool "reveal" towards the end of last night's Agents of S.H.I.E.L.D. - SPOILERS AHEAD! As Agent Phil Coulson tries to find out how he was brought back to life in the hope of saving the life of his protege Skye - using some of those means - he and his team infiltrate the "Guest House", a remote facility which only Level 10 SHIELD agents should have access to, which they also point out is not a SHIELD facility. They're trying to find a substance - GH 325 - and they do. But Coulson decides to go further and go behind a hatch marked T.A.H.I.T.I. to find the source of the serum, and he finds the floating torso of the Blue Guy:

All the tubes that extract the sera lead back to two tubes coming from the floating torso. Somehow, they're harvesting his bodily fluids - or something. So who is the blue guy?

My theory? Somehow, the operators of the facility have acquired a Kree... one of the advanced alien races of the Marvel Universe: http://en.wikipedia.org/wiki/Kree. Our floater reminded me - in a way - of the Kree Supreme Intelligence:

We can be pretty sure the Kree will be showing up in the Guardians of the Galaxy movie, as Ronan the Accuser - a Kree, at least in the comic books - is a major character. So perhaps this is a way to begin to introduce the aliens? On the other hand, my buddy Bill Gladman thinks the floater could be an Atlantean (http://ow.ly/uhPWG), specifically the character U-Man - an Atlantean named Merrano: http://en.wikipedia.org/wiki/U-Man. But I'm hoping it's a Kree.

That leads to another bit of speculation - whose base was that? Who ran the "Guest House"? If my guess on the identity of the floater is right, it leads me to believe it was a S.W.O.R.D. facility. S.W.O.R.D. is like the interstellar version of S.H.I.E.L.D. http://en.wikipedia.org/wiki/S.W.O.R.D._(comics) And? S.W.O.R.D. was invented in Marvel Comics Astonishing X-Men Vol.3 #6 by... Joss Whedon. Who has a little something to do with all this.