Wales was the only land to totally repulse the invasions of the fierce Vikings. Dane Wulfdin finds out why when he and his crew attack Rhodri Mawr's shire to seek revenge on the Welsh leader for humiliating them in Anglesey. Rhodri's soldiers promptly ambush the Norsemen, and Dane becomes stranded in a foreboding realm filled with monsters, mayhem, and magic. The warrior makes a narrow escape from his human pursuers only to be bewitched by wicked Queen Shera. During his strange odyssey, Wulfdin also battles a dragon, a kraken, and giants straight from one's worst nightmare.