The Attack on the ATCU Headquarters was a terrorist operation orchestrated by the Watchdogs to make their presence known to the world by attacking a facility of the Advanced Threat Containment Unit, which they suspected to hide Inhumans who the Watchdogs despised.
In 2014, Felix Blake was hospitalized after a fierce encounter with the cyborg known as Deathlok resulted in his spine being broken. Now rendered paraplegic, the S.H.I.E.L.D. operative spent several months recovering from his extensive injuries.
It wasn't until after his release that Blake learned about the HYDRA Uprising, an event that resulted in S.H.I.E.L.D. being disavowed by the international community and labeled a terrorist organization.
The following year, Blake discovered a large group of individuals who formed negative opinions of the Inhumans and posted them on the Internet. Through unknown means, Blake assembled and radicalized these individuals, turning them into a group bent on exterminating the Inhumans.
Sometime later, Blake was approached by Giyera, a representative of high-ranking HYDRA operative Gideon Malick who promised to provide the Watchdogs with advanced weaponry on the condition that they steal a nuclear warhead from an Indiana facility operated by the Advanced Threat Containment Unit.
- "We want this information released. A list of who they are, where they are. Or you will have war on your hands. We are the Watchdogs. You will obey."
- ―Watchdog Alpha
After arriving at the facility with his unit, Watchdog Alpha recorded a message to be sent to WZTM News in South Bend. In the message, Watchdog Alpha called out the federal government for keeping the Inhumans' existence a secret, using the Battle of Sokovia and the Inhuman Outbreak to justify his current actions.
Watchdog Alpha proceeded to demand the government release any information regarding the whereabouts of potential Inhumans before taking out a Nitramene-filled rifle and firing it at the facility. Moments after he and his fellow Watchdogs evacuated the premises, the Nitramene detonated, causing the facility to be destroyed by the blast and decimated in the subsequent implosion.
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