G.H.

"We need to shut it down and destroy the host." "You can't do that! It's thousands of years old, pre-dating the pyramids! We haven't even scratched the surface of the benefits."

- Phil Coulson and Dr. Goodman

The G.H. or Guest Host is an extraterrestrial corpse that was used by Project T.A.H.I.T.I. to synthesize drugs from his bodily fluids for the purpose of bringing people back to life, particularly fallen Avengers.

Description
The G.H. is a blue extraterrestrial with the Words of Creation marked on its chest. It has lost the lower half of its body, making some of its organs visible, missing its eyes and part of its mouth, exposing some of its teeth. According to Dr. Goodman, the corpse predated the Pyramids of Giza.

History
The G.H. was a deceased extraterrestrial that was discovered in World War II by HYDRA amongst various other objects of varied importance, including the Obelisk. In 1945 HYDRA was defeated and the corpse was confiscated by the Strategic Scientific Reserve. It remained in their custody until the formation of S.H.I.E.L.D., when it fell into their possession.

The bodily fluids of the extraterrestrial were later found to have highly potent regenerative capabilities, and, under the orders of Nick Fury, the corpse was relocated to the Guest House, a former World War II bunker. Its bodily fluids were harvested and used to create formulas like the GH.325, as part of Project T.A.H.I.T.I., with the prime intention being to ensure the continued survival of the Avengers in case any member of the team were to perish.

Agent Phil Coulson was charged with heading the operation, but after the formulas that were harvested from the G.H.'s body proved to be dangerous to the participants, the project was shut down. It was almost immediately reinstated after Coulson was killed by Loki, and Fury had Coulson undergo a procedure that saw the GH.325 resurrecting him. However, Coulson's mind was erased to ensure he would not remember the traumatic procedure, and as a result forgot completely about his involvement with Project T.A.H.I.T.I.

Coulson later rediscovered the Guest House while attempting to use the GH.325 to revive Skye. Inside, he found the G.H. corpse being preserved in a stasis pod, and was left clearly disturbed by the discovery.

The specimen was apparently destroyed when the bunker was blown up by the auto-destruction activated while Coulson's Team infiltrated the Guest House to retrieve the GH.325 and use it to save Skye.

When Sif came from Asgard chasing Lorelei, Coulson hoped that she could help him to identify what species the G.H. specimen was; however, after naming different blue-colored aliens, she stated that none of them have visited Earth.