Halo: Nightfall Second Stories
From Halopedia, the Halo wiki
Halo: Nightfall Second Stories were bonus clips originally unlocked through watching episodes of Halo: Nightfall on the Halo Channel. The clips were later put into collections to expand their target audience.
Second Story Collections
- Main article: Nightfall: Acquisition
Classified ONI EYES files reveal the UNSC’s attempts to discern the methods and means by which a deadly new element was collected, trafficked, and ultimately employed against the colonists of Sedra. 
Nightfall: Human Element
- Main article: Nightfall: Human Element
Through classified ONI EYES files, this Second Story collection brings you face to face with those most impacted by the deadly attack on the outer colony of Sedra.
- Main article: Nightfall: Intervention
Go deep into the classified ONI EYES files that detail the sometimes harsh reality of ONI's constant involvement and meddling to find ever-elusive answers by any means necessary.
List by episode
The following list details what Second Stories were unlocked in what episode of Halo: Nightfall:
- Halo Waypoint - Halo Channel, Nightfall: Acquisition (Retrieved on Oct 31, 2015) [archive]
- Halo Waypoint - Halo Channel, Nightfall: Human Element (Retrieved on Nov 5, 2015) [archive]
- Halo Waypoint - Halo Channel, Nightfall: Intervention (Retrieved on Oct 30, 2015) [archive]