Vikings Season 4 is hitting on all cylinders in its second half of its run, and our reviews and episode guide are compiled here.

Vikings Season 4 has certainly not disappointed us so far this year. Even with the long hiatus between the midseason finale and its eventual return date, Vikings Season 4 lost no momentum at all.
We've got all the info you need on the next episode of Vikings, as well as a complete episode guide.
Vikings Season 4 Return Date
Season 4 continues, and here's what we thought of the latest episode. The next episode of Vikings is called "Crossings" and it airs at 9pm ET on January 4th. Here's a recap of the action in last week's episode:
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Vikings Season 4 Episode Guide
Click the links below to go to our full reviews!
Vikings Season 4 Episode 1 "A Good Treason"
Entry to Valhalla eludes Ragnar but as he lies in his sick bed in Kattegat events unfold beyond his control. Bjorn orders the arrest of Floki for Athelstan's murder while in Paris, Rollo betrays the last of his Viking supporters to strengthen his position in the French Court. Meanwhile, in Hedeby, Kalf announces joint Earldom with Lagertha, but is power-sharing Kalf's true intention and is Lagertha actually willing to share what once was hers? (aired 2/18/16)
Vikings Season 4 Episode 2 "Kill The Queen"
As Ragnar and Floki remain at odds in Kattegat, Rollo makes great efforts in Paris to win over his new bride, Princess Gisla. Bjorn's survival skills are put to the test in the wilderness, while King Ecbert sets the task for his son Aethelwulf to rescue Queen Kwenthrith from opposing forces in Mercia. (aired 2/23/16)
Vikings Season 4 Episode 3 "Mercy"
Ragnar tells Floki of a heavy price he has paid for his actions but as Floki remains a prisoner, a mysterious visitor to Ragnar counsels mercy. Intrigue prevails at the French Court as Rollo finds an unlikely ally in Count Odo, but can't escape the contempt of his new bride. Bjorn must fight a fierce opponent in the wilderness but will he survive the threat that Erlendur and Kalf are sending his way? (aired 3/3/16)
Vikings Season 4 Episode 4 "Yol"
The Yule Log burns in the Great Hall in Kattegat and, though Floki must remain out in the cold, other visitors are welcomed, among them a Norwegian King and Bjorn, with a new partner we've met before. King Aelle visits Wessex for Christmas and is not impressed with how family relations are developing. In Paris, Rollo's future hangs in the balance--can he win-over his new bride, Gisla, as a Papal Delegation arrives to arrange a divorce? (aired 3/10/16)
Vikings Season 4 Episode 5 "Promised"
There's an air of betrayal at Court in Paris and Wessex as those whom Odo trusts plot against him and Ecbert agrees to support Kwenthrith in Mercia, but is Ecbert a true ally? Ragnar confides in Yidu his darkest secret. (aired 3/17/16)
Vikings Season 4 Episode 6 "What Might Have Been"
Ragnar announces another raid on Paris at the Thing in Kattegat and although the fleet is battered by a storm after it sets-out, the greatest challenge for the Vikings lies ahead in Paris, where Rollo awaits. Ecbert also has a journey in mind as he dispatches Aethelwulf and Alfred on a pilgrimage to Rome. (aired 3/24/16)
Vikings Season 4 Episode 7 "The Profit and Loss"
In England, King Ecbert's ambitions are revealed as he schemes to gain the crown of Mercia while outside Paris, the Vikings attack with considerable force but can they breach Rollo's defenses? Meanwhile, Harbard, the mysterious wanderer, returns and causes a stir amongst the women of Kattegat. (aired 3/31/16)
Vikings Season 4 Episode 8 "Portage"
Defeat for the Vikings calls Ragnar's leadership into question as they evacuate their camp and move back down-river. Ragnar himself remains inscrutable until he orders the fleet to beach at a cliff face and unveils an ingenious plan. Rollo and Gisla have news that strengthens Rollo's position at the French Court whilst Count Odo fails to identify his true enemies, with fatal consequences. (aired 4/7/16)
Vikings Season 4 Episode 9 "Death All 'Round"
The labors of the Vikings eventually bear fruit as, within sight of Paris, they re-launch their boats but this time along with some interesting structures that Floki has made. Aethelwulf and Alfred eventually arrive in Rome and honors are conferred by Pope Leo but relations are not so cordial in Wessex between King Ecbert and the disgruntled King Aelle. (aired 4/14/16)
Vikings Season 4 Episode 10 "The Last Ship"
A ferocious battle between the Vikings and the French eventually comes down to Ragnar against Rollo and the outcome seals the fates of the two brothers. (aired 4/21/16)
Vikings Season 4 Episode 11 "The Outsider"
Ragnar has returned to Kattegat where he devises a plan to return to Wessex to right past wrongs. (aired 11/30/16)
Vikings Season 4 Episode 12 "The Vision"
The Kattegat locals chide Ragnar that the gods have deserted him as he struggles to crew his voyage to Wessex. Bjorn prepares to fulfill his dream of exploring the Mediterranean. (aired 12/7/16)
Vikings Season 4 Episode 13 "Two Journeys"
Ragnar and Ivar face a difficult decision in regard to their crew. Bjorn has an unexpected reunion. (aired 12/14/16)
Vikings Season 4 Episode 14 "In The Uncertain Hour Before Morning"
Lagertha attempts to fulfill a long-held ambition. Ragnar negotiates an unexpected concession from King Ecbert. (aired 12/21/16)
Vikings Season 4 Episode 15 "All His Angels"
Ragnar and Ivar plot against the Saxons and reach a new level of understanding. (aired 12/28/16)
Vikings Season 4 Episode 16 "Crossings"
air date: January 4
Vikings Season 4 Episode 17 "The Great Army"
air date: January 11
Vikings Season 4 Episode 18 "Revenge"
air date: January 18
Vikings Season 4 Episode 19 "On the Eve"
air date: January 25
Vikings Season 4 Finale - Episode 20 "The Reckoning"
air date: February 1
Vikings Season 4 Trailer
The History Channel released a trailer for Vikings season 4 just before the new year, and it appears as though the Ragnar's tenuous position among his people with the absence of Rollo will be taking center stage. Although Ragnar enjoyed a surprising victory in Paris at the end of season 3, there are those who are speculating on the fate of the kingdom should Ragnar die of his illness. Political maneuvering is tricky, especially with the perception that Rollo betrayed his people by staying in France.
The trailer below is rife with plenty of what fans have enjoyed from Vikings in past seasons, and it looks like they won't be disappointed this season either.