Vikings 'The Most Terrible Thing' preview: A mother killed her son, what could be more terrible than that?

The trailer for the upcoming episode titled 'The Most Terrible Thing' shows an unbelievable deal between two unlikely allies and Ivar advancing to attack Wessex

After a mother poisoned her own son, what other terrible things are left to unfurl?

The upcoming episode of History Channel's hit, 'Vikings,' is titled 'The Most Terrible Thing,' so, the natural question is what could it be? In season 5 so far, we have already witnessed terrible, terrible things, such as the killing of a Bishop in a church, Ivar the Boneless' ruthless murder of the Seer and Queen Judith poisoning her own son, Aethelred, in the recent episode.

The promo trailer for episode 17 picks up from there; Judith holding her dead son in her arms, but the scene quickly steers to the unlikely alliance developed between Bjorn Ironside and King Harald. King Harald hasn't proved himself to be a good ally, neither to Ivar nor to Jarl Olavsonn. His alliance with Bjorn is also questionable since he's laid his eyes on Gunnhild, who, of course, has something going on with Bjorn, and Harald as already noticed that.

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