As we explained previously, G.H. stands for Geheneris HalaSon Mahr Vehl, which is the Ultimate Comics version of Captain Mar-Vell. That explains the â€œGHâ€, and as the Marvel Cinematic Universe seems to combine elements from Marvel 616 and Ultimate Marvel it would make sense.
Geheneris HalaSon is a member of an alien race known as the Kree. This is a major element of the Marvel Cosmic Universe, and you’ll see the Kree in a big way in Guardians of the Galaxy. The main villain, Ronan the Accuser, is a Kree. They haven’t actually revealed an official image of Ronan yet but eagle-eyed viewers of the “Assembling a Universe” special Marvel recently aired could spot him in the background in some shots:
As the Kree play a huge part in Guardians of the Galaxy and the larger cinematic universe that Marvel is building, introducing them in Agents of S.H.I.E.L.D. with the mysterious “G.H.” makes a lot of sense. People will want to know that “G.H.” means and who that blue guy was in the tank, so they’ll research it and discover the Kree. Then when they hear about the Kree in Guardians of the Galaxy with Ronan the Accuser being the main villain, they’ll realize it really is all connected and then tune into Agents of S.H.I.E.L.D. next season to see what other hints the show will drop.
And this is why Marvel Studios is awesome.