- "I can't believe this actually worked."
- ―T.A.H.I.T.I. Patient 4[src]
T.A.H.I.T.I. Patient 4 was a former S.H.I.E.L.D. agent.
T.A.H.I.T.I. Patient 4 was a S.H.I.E.L.D. agent who discovered that he was dying. Phil Coulson chose him, and five others, to be a part of Project T.A.H.I.T.I. and to be taken to the Guest House where he was injected with GH.325 and his fatality was cured. However, post-operation, this agent felt constantly compelled to draw alien symbols. These desires were driving him insane, like the other five patients.
Taking the suggestion of Dr. Goodman, Coulson allowed the Memory Overwriting Machine to be used on him so that he could begin a new life without the memories of his past conflicting with the DNA memory overwrite that G.H., the Kree from whose fluids GH.325 was derived, was causing.
Patient 4 was killed by Sebastian Derik, another participant of Project T.A.H.I.T.I. before Coulson shut it down.
- Sebastian Derik - Killer