Cullen searches for clean water when a cholera outbreak threatens his workers on Hell on Wheels. "Cholera" is the seventh episode of the show's third season.
Cullen may lose his position when an injunction against Union Pacific threatens Hell on Wheels. "One Less Mule" is the sixth episode of the show's third season.
Elam and Cullen run into trouble in Indian territory while looking for a new source of lumber on Hell on Wheels. "The Game" is the third episode of the show's third season.