Cullen solves a Chinese labor strike in the wake of violence. Meanwhile, Durant pulls Mickey deeper into Union Pacific business.

Cullen contends with violence in Chinatown set off by disgruntled railroad workers. Meanwhile, the Swede manipulates Phineas in his plot against the Mormons.

Cullen and Fong find themselves in peril as they transport a locomotive over the Sierra Nevada mountains. The Swede gains Phineas’ trust.

Cullen is in California with the Central Pacific Railroad, and must deal with the new workers.

The golden spike, government hearings and unpredictable actions mean new beginnings and endings for the survivors.

The race to finish the railroad comes down to inches, forcing all parties to contemplate the end of the line, and what the future holds for them.

Chang discovers Mei’s secret and forces her to flee Truckee. Meanwhile, Cullen’s search for her brings new realizations while exorcising old demons.

Cullen faces life-changing decisions in Utah as Truckee adapts to life without him.

Mickey’s dirty business with Durant leaves him with blood on his hands. Meanwhile, Campbell’s return to town complicates Louise’s life.

The Swede’s murderous rampage on the Hatch homestead results in a long overdue showdown with Cullen.

Cullen’s nitroglycerin experiment provides an explosive backdrop for the railroad life in Truckee. Durant’s plan turns deadly.

Cullen and Durant meet with President Grant to discuss the future of the railroad; the Swede puts his plan against the Mormons in action.

Cullen and Mei escort precious cargo through the California wilderness; Eva nurses Louise back to health.

Cullen and Durant fight to save the life of a criminal. Meanwhile, Louise tries to provide support as Ruth copes with a great loss.

Cullen, Durant, and Campbell try to negotiate a settlement on how the streets will be policed. An act of terror strikes Cheyenne.

Cullen goes head to head with the new marshal to recover his arrested railroad workers. Campbell confronts Louise over a story.

Cullen makes a decision to ensure his family’s safety. Campbell hires a new federal marshal to clean up the streets.

Cullen attempts to reconnect with Elam upon his return. Durant takes matters into his own hands while putting an old problem to rest.

Following an attack by a bear, Elam struggles to survive in a Comanche village and find his way back to Cheyenne.

Cullens’s family is at risk when a stranger arrives, stirring up old feelings; The Swede faces the consequences.

Cullen deals with trouble at home as he takes railroad matters into his own hands. Campbell makes a move against Durant and Mickey.

Cullen goes back to work on the railroad and butts heads with his new boss. Durant and Campbell battle over a valuable piece of real estate.

As Cullen plans an exit from Fort Smith, he challenges The Swede; when a new adversary arrives, Cheyenne feels his presence.

Cullen awaits the birth of his baby, laboring under The Swede’s thumb at Fort Smith. Durant deals with the fallout from a railroad accident.

As the railroad prepares to leave Cheyenne behind in the Season 4 finale, Cullen returns to Fort Smith to retrieve his family.

Cullen grapples with Ruth’s unexpected decision; Louise jeopardizes her reputation to fight for a story she believes in.

When a cholera epidemic hits Hell on Wheels, Cullen must find fresh water before his workers die. Durant faces political fallout.

Durant files an injunction against Union Pacific, threatening Cullen’s position; Elam deals with a dangerous newcomer.

Cullen helps Elam track down a dangerous criminal; the town prepares to move down the tracks.

Cullen grapples with consequences while Elam mounts a rescue attempt. Durant receives Gen. Grant and the U.P. board in Cheyenne ahead of the deadline.

Cullen and Elam try to secure a new lumber source following a railroad accident; Durant tells Louise a secret about Cullen.

Cullen and Elam search for their stolen food on the prairie; a stranger’s arrival threatens Elam’s family.

An unexpected roadblock forces Cullen to make a difficult choice as a reporter arrives in Hell on Wheels. Elam struggles with his new boss.

With General Grant’s deadline only two days away, a gang of riders attacks Cheyenne while Cullen and Elam pay Durant a visit.

After his workers defect to the Mormons, Cullen recruits Durant to help get them back. Meanwhile, Sean and Mickey’s past comes back to haunt them.

As Finch and Reese try to protect six people simultaneously, clues lead them to a coastal town; when a storm forces Finch and Reese to seek shelter in a police…

The latest POI — a deadly yet sexy government operative (Sarah Shahi) who tackles terrorist threats — proves difficult for Reese and Finch to protect.

After a hard winter, Cullen and Elam travel to New York to secure their positions on the railroad as Durant fights for his legacy from prison.

When a virus causes the machine to malfunction, numbers are issued irregularly; the team searches for an extremely elusive tech millionaire.

Finch and Reese team up with unexpected allies as they race to fix the machine; as Detective Carter tries to apprehend Cal Beecher’s murderer, she finds herself up against HR…