No. of episode	Title	Original air date
1	"Rites of Passage"	March 3, 2013
Ragnar and his brother, Rollo, return from a battle in the Baltic lands during which Ragnar has visions of the god Odin and his valkyries. Home again, Ragnar takes his son Bjorn to Kattegat, for Bjorn's rite of passage. Left at home, Ragnar's wife Lagertha quickly dispatches two would-be rapists. While in Kattegat, Ragnar convinces Rollo that raids to the West are worthwhile and possible, thanks to new navigational tools, but is rebuked by his ruler, Earl Haraldson, who continues to order raids into the Baltic; but, also has the upstart, Ragnar, watched. Bjorn and Ragnar visit Floki, Ragnar's friend and a gifted shipwright, who has been secretly building a new type of longship, which they successfully test. Meanwhile, back at home, Rollo makes unwelcome advances on Lagertha. Ragnar has yet another vision of Odin, standing on the shoreline. This convinces Ragnar to finally move on with his plan.
No. of episode	Title	Original air date
2	"Wrath of the Northmen"	March 10, 2013
After gathering volunteers, Ragnar, Rollo, and Floki embark on an unauthorized raid to the west. Lagertha violently objects to Ragnar's refusal to take her along. Earl Haraldson has the blacksmith who forged Ragnar's anchor killed. At sea the crew are caught in a storm, which a manic Floki interprets as Thor proving his ship unsinkable. On land, monks see the ominous sign of a cloud shaped like a dragon. After a tense voyage, Ragnar's men land on the coast of England, near the monastery of Lindisfarne, which they proceed to sack. They kill most of the monks and capture the rest to take back as slaves, including the young Athelstan, whom Ragnar protects from death at Rollo's hands.
No. of episode	Title	Original air date
3	"Dispossessed"	March 17, 2013
Ragnar's warband returns in triumph to Kattegat, where the Earl immediately confiscates the plundered riches except for one piece per man. Ragnar picks the distraught Athelstan and returns home. The monk's faith and his vow of chastity perplex Ragnar, but he, nonetheless, gathers useful intelligence about the kingdom of Northumbria. Based on this new insight, Earl Haraldson authorizes another raid on England. Now accompanied by Lagertha and the Earl's brother, Knut, Ragnar re-embarks post-haste, leaving Athelstan to mind the farm and the children. As the Vikings set foot on English soil, they are met by the local sheriff and a handful of armsmen, who invite the newly landed "traders" to meet King Aelle. Ragnar agrees, but his other warriors' distrust incites a battle in which the Northumbrians are slaughtered.
No. of episode	Title	Original air date
4	"Trial"	March 24, 2013
The Vikings raid the Northumbrian village of Hexham with little bloodshed, as the villagers are gathered for Mass. During the raid, Lagertha kills Knut when he tries to rape her. Back on the beach, the raiders defeat a superior Northumbrian force under Lord Wigea, sent by King Aelle, and return to Kattegat. There, Earl Haraldson has Ragnar, who claims to have killed Knut, arrested and tried at the Thing assembly. The Earl's ploy to bribe Rollo to testify against Ragnar fails, and Ragnar is acquitted. As the raiders celebrate with Athelstan and Ragnar's children, they are assaulted by armed men. Although Ragnar's followers prevail, his companion Erik is killed.
No. of episode	Title	Original air date
5	"Raid"	March 31, 2013
When Earl Haraldson's raiders assault Ragnar's settlement, Ragnar, Lagertha, Athelstan, and the children narrowly escape in a boat. Ragnar is severely wounded, and Athelstan saves him from drowning. The family hides in Floki's house, where the shipwright and his lover Helga slowly nurse Ragnar back to health. Meanwhile, Earl Haraldson marries off his daughter, Thyri, to a elderly earl from Svealand, against his wife, Siggy's, wishes. Aware that the Earl is watching Ragnar's friends, Rollo offers his services to Haraldson. Haraldson has Rollo seized and tortured in an unsuccessful attempt to discover Ragnar's whereabouts. As Torstein, a friend of Ragnar, brings word of this to the still-weak Ragnar, Ragnar sends Floki to deliver a challenge to the Earl — a single combat with Ragnar.
No. of episode	Title	Original air date
6	"Burial of the Dead"	April 7, 2013
The Earl accepts Ragnar's challenge, and the two meet in single combat. Ragnar kills Haraldson and Siggy kills Bjarni. After Ragnar becomes the new Earl, he grants his dead foe a chieftain's burial at sea, and Athelstan is revolted to see a slave agree to follow her master in death. During the following winter, Lagertha becomes pregnant and Siggy accepts Rollo's protection and his proposal to marry an Earl – himself. Athelstan asks Ragnar about Ragnarök. Unknowingly Athelstan has broken a social taboo, but Ragnar informs him by feeding him a drug and having the village seer tell Athelstan. This causes the monk to have horrific visions of the world's end. As spring beckons, three of Ragnar's ships sail up the River Tyne. After throwing the luckless Wigea into a snake pit, King Aelle prepares to meet the raiders in battle.
No. of episode	Title	Original air date
7	"A King's Ransom"	April 14, 2013
The Vikings set up a fortified camp, assault the Northumbrian besiegers at night, and capture the king's brother, Aethelwulf. In a meeting with the king, Ragnar demands 2,000 pounds of gold and silver as a price for the Vikings' departure. Aelle agrees but demands that one Viking be baptised a Christian, and to Floki's scorn, Rollo agrees. Instead of paying the ransom, Aelle has his men attack Ragnar's camp, but they are bloodily repelled, ending with Rollo finishing off several Saxons single-handedly, in an attempt to prove he's still faithful to his gods. After Ragnar sends Aethelwulf's corpse to Aelle, the king finally pays the ransom but swears vengeance upon Ragnar as he watches the raiders depart. Meanwhile, back in Scandinavia, Lagertha rules in Ragnar's stead, accepts Siggy's offer of service, and suffers a miscarriage.
No. of episode	Title	Original air date
8	"Sacrifice"	April 21, 2013
As Lagertha is unable to conceive another son, Ragnar takes his family and followers to the temple at Uppsala to attend a great rite to the Æsir and Vanir. He pledges fealty to King Horik, who charges Ragnar with an embassy to Jarl Borg, a rival encroaching on Horik's lands. Siggy chides Rollo for not paying attention to his own advancement and sleeping with other women. Priests question Athelstan, now in norse garb, about his faith. Athelstan denies Christ three times. They discern that despite his claims, he has not renounced Christianity, and they declare him unfit to be sacrificed to the gods. Leif, Ragnar's follower, volunteers in Athelstan's place for this single honour and is sacrificed by King Horik at the climax of the rite together with eight other men and numerous animals.
No. of episode	Title	Original air date
9	"All Change"	April 28, 2013
Ragnar's embassy to Jarl Borg in Götaland fails, as King Horik rejects a compromise settlement about the contested land. Driven by ambition and jealousy, Rollo agrees to support Borg against Ragnar. In Kattegat, a disease kills many inhabitants, including Lagertha's daughter, Gyda, and Siggy's daughter, Thyri. Lagertha asks the seer about Ragnar and her future but the seer refuses as he only sees misery. Underway, Ragnar meets and is seduced by the princess Aslaug; eventually, she reveals she carries his child.