![image](https://comicvine.gamespot.com/a/uploads/square_tiny/11/117763/3151488-cube.jpg)
The Cube
The Cube is a S.H.I.E.L.D. prison and testing center for their "Villain Rehabilitation Program". Falling into disuse after most the inmates escaped during the Secret Invasion, it served as the base of operations of Norman Osborn's Thunderbolts.
![cover](https://comicvine.gamespot.com/a/uploads/original/11/117763/3151488-cube.jpg)
Following his declared war on Earth, the Kree scout Noh-Varr was imprisoned in The Cube which he proclaimed as the "start of the new Kree Empire".
During the Civil War, the Cube was used as a villain correction facility placed by S.H.I.E.L.D.
By the time the Secret Invasion hit Earth, Noh-Varr had assumed control of the entire facility and had become it's self-appointed Warden.
Following Norman Osborn's acension to power, Noh-Varr became Captain Marvel and his duties meant he was no longer incarcerated. The Cube instead became the headquarters to Osborn's black-ops Thunderbolts squad.