Vinland Saga - Season 1 Episode 5 -

After Askeladd kills Thorfinn’s father Thors, Thorfinn hides inside Thor’s ship and bides his time until the opportunity to take revenge. However, life on the ship is harsh without any food or water, and Thorfinn grows weaker day by day. One day, Thorfinn, armed with his sword, attempt to attack Askeladd in his sleep