As ordered by the Red Skull, Fortress Null was built around the Hammer of Skadi to defend it.
Once the Serpent awoke, the fortress became his palace.
It was then seen hovering above Manhattan.
The flying fortress soon reached Broxton.
Fortress Null was apparently destroyed in the battle between the Serpent and Thor.
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- Appearances of Fortress Null
- Minor Appearances of Fortress Null
- Media Fortress Null was Mentioned in
- Location Gallery: Fortress Null
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