As the railroad expands westward into Cheyenne, Wyoming, Cullen Bohannon faces greed, corruption and conflict between government and homesteaders.

1. The Elusive Eden 43m Cullen waits in Fort Smith until Naomi gives birth to their baby. After the baby is born, the Swede refuses to let Cullen take his family with him.

2. Escape from the Garden 43m To undermine the Swede's guise as Bishop Dutson, Cullen confesses to past crimes. As Cullen leaves Fort Smith, a new adversary arrives in Cheyenne.

3. Chicken Hill 43m Durant refuses to reinstate Cullen as chief railroad engineer. Durant and Campbell are at odds over a hill, and Cullen refuses Campbell's job offer.

4. Reckoning 43m After a disastrous attempt to tunnel through the hill, Cullen plans a new line of track. Naomi wants more from Cullen, and a broke Eva goes to Durant.

5. Life's a Mystery 43m A dangerous stranger arrives in Cheyenne claiming to know Cullen. In Fort Smith, Brigham Young comes to question the Swede, but has his own agenda.

6. Bear Man 43m Elam struggles to survive after a vicious bear attack. He's nursed back to health at a Comanche village, where hallucinations start to control him.

7. Elam Ferguson 43m When a changed Elam returns to Cheyenne, Cullen tries to reach him. Cullen helps Durant after a beating, then uses the situation to his own advantage.

8. Under Color of Law 43m Naomi and the baby leave for Fort Smith. To clean up lawless Cheyenne, Campbell hires Sidney as the new marshal. Sidney arrests Psalms and his crew.

9. Two Trains 43m Cullen's failure to convince Sidney to release Psalms and his railroad crew has consequences for everyone. Campbell and Louise become more involved.

10. Return to Hell 43m Cullen, Durant and Campbell try to take back Cheyenne's streets. Cullen demands that Sidney pay for his treachery. Sidney challenges Cullen to a duel.

11. Bleeding Kansas 43m Cullen, Durant and Eva try to save the life of a criminal. Ruth awaits her fate. A new saloon proprietor arrives in Cheyenne.

12. Thirteen Steps 43m Cullen agonizes over Ruth's decision. Louise publishes a damning article about Campbell. As the railroad nears a milestone, Cullen makes a decision.