In the fifth episode of Hell on Wheels Season 2, Cullen's past haunts Hell on Wheels, leaving the fate of the railroad hanging in the balance. You can learn more about what happened by checking out the online extras for Episode 5, "The Railroad Job":

• An "Inside Hell on Wheels" video that takes you behind the scenes of Episode 5.

• Ten production stills of Episode 5, plus two sneak peek photos from next week's episode.

• The Hell on Wheels Episode 5 Ultimate Fan Game.

• An open thread for this episode in the Hell on Wheels Talk forum.

• A sneak peek video for Episode 6, "Purged Away With Blood."

Also worth your attention:

• Which Hell on Wheels Character Are You? Game

• Cullen Bohannon Ultimate Fan Game

• Anson Mount's Best Movies

• Hell on Wheels desktop wallpapers, IM icons and Facebook Timeline photos

• Sign up for the Hell on Wheels Telegraph Newsletter

• Hell on Wheels on Facebook

• Hell on Wheels on Twitter