Halo: Nightfall Second Stories

Halo: Nightfall Second Stories were bonus clips originally unlocked through watching episodes of Halo: Nightfall on Halo Channel. That was later put into collections so the audience for them became larger.

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.
 * Outbound Cargo - Part 1
 * Outbound Cargo - Part 2
 * Walk the Path
 * The Path of Belief

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.
 * Seed of Honor
 * Exposure
 * ONI: Compliance
 * ONI: Trade Barriers
 * Indebted Travelers
 * ONI: Unit 54

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.
 * Rhoen Border Security
 * Cooperative Protocol
 * Quartermaster
 * Soldier Within
 * RECON-14

List by episode
The following list details what Second stories were unlocked in what episode of Halo: Nightfall:

Episode 1:
 * Exposure
 * The Path of Belief
 * RECON-14

Episode 2:
 * Soldier Within
 * ONI: Unit 54
 * ONI: Walk the Path

Episode 3:
 * Outbound Cargo - Part 1
 * Indebted Travelers
 * Outbound Cargo - Part 2
 * Rhoen Border Security

Episode 4:
 * Quartermaster
 * Seed of Honor
 * Cooperative Protocol

Episode 5:
 * ONI: Compliance
 * ONI: Trade Barriers