Although the Vikings [1] cast may have debuted the first trailer for season four at their Comic-Con panel in July, prepare yourself, because the show just released an even deeper look into what will go down, and it's a serious hold-on-to-your-butts situation. Bjorn calls for Floki's head, Rollo marries Gisla, Rollo and Ragnar are ready to come to blows, and blood, blood, blood. As Ragnar warns us: "Don't waste your time looking back; you're not going that way." Watch it below, and catch season four when it premieres on Feb. 18.