Bryan Mills, a former member of the United States Army Special Forces, seeks vengeance after he fails to protect one of those closest to him.

Journey into a thrilling ancient world in this epic new series about history's bravest and most brutally fearsome warriors; Vikings. Ragnar, a would-be Viking chieftain, longs to fulfill his destiny as an explorer and conqueror, alongside his ambitious brother Rollo and loyal wife Lagertha. But as Ragnar leads daring raids in distant realms across the ocean, treacherous forces in his Norse homeland conspire against him.

Vikings returns for a gripping fourth season. Season three culminated with the extraordinary battle in Paris, where Ragnar seized victory from the jaws of defeat, but still returns to Kattegat dangerously ill. Thoughts of his death galvanize the forces who seek to succeed him as king, including his wife Queen Aslaug and his oldest son, Bjorn. Meanwhile, Lagertha continues power struggles with her calculating, former second in command, Kalf.