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"HYDRA had scientists embedded at the base. Explains how they took it so quickly."
"A friend of mine was stationed there. He said it got bad fast."
Phil Coulson and Alphonso Mackenzie[src]

The Battle at the Sandbox was the conflict between HYDRA and S.H.I.E.L.D. during the HYDRA Uprising for the control of the Sandbox, a S.H.I.E.L.D. research facility.


"What will happen to him?"
"They're moving him to the Sandbox, but not as a researcher. They want to keep an eye on him."
Melinda May and Phil Coulson[src]

Donnie Gill, who was taken into S.H.I.E.L.D. custody for his illegal experiments with the Atmospheric Moisture Freezing Device, discovered his ability to lower the temperature of objects upon touch by touching the window of the S.H.I.E.L.D. SUV.[1] Gill was taken to the Sandbox and trained in harnessing his powers which then amplified. Eventually he was brainwashed into working for HYDRA.



In 2014, after being exposed and defeated by Captain America and his allies in the Battle at the Triskelion, the high command of HYDRA ordered all of their sleeper agents to purge any S.H.I.E.L.D. loyalists or non-HYDRA agents and capture all S.H.I.E.L.D. facilities for assuring their survival.[2]


"Donnie didn't escape the Sandbox! He took the Sandbox for HYDRA."
Leo Fitz[src]

Agents from the Sandbox were revealed to be undercover HYDRA operatives and attacked the facility. HYDRA activated Donnie Gill's brainwashing and Gill used his freezing powers to eliminate many of the S.H.I.E.L.D. agents. Eventually, HYDRA gained control of the facility.[2]



Donnie Gill in Morocco

Donnie Gill temporarily broke his brainwashing and went on the run. Several months later, HYDRA and S.H.I.E.L.D. caught up with Gill in Casablanca, Morocco where he was seemingly killed by Skye on board the Maribel del Mar.[2]


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