Early in the Shattered World Crisis, the Letter of Gabriel was dispatched to aid in relief efforts in Station Square, and arrived to find that the Sky Patrol and Freedom Fighters were already in the midst of aiding stranded and endangered civilians. They then took over the relief effort, which was their assigned task as part of Operation: Triage.
Soon on, the plotting of Sigma brought catastrophe to the Letter of Gabriel. Fused together with a government building from Earth 20XX by Sigma's Unity Engines, both were caught up in an explosion, resulting in the apparent demise of all aboard, including Captain and Commander Tower and Team Dark. These events were subsequently undone by the actions of Xander Payne.
- The Letter of Gabriel is based on one of the G.U.N. battleships seen in Shadow the Hedgehog.
- The Letter of Gabriel is named after the archangel of the same name.
- The ship's name references how Gabriel would deliver messages to a number of people in the New Testament.