A Norse warrior becomes embroiled in a feud with a former slave over the succession to the Northumbrian throne, unaware his arch-enemy is really his half-brother. Matters come to a head when they both set their sights on a Welsh princess, leading to a confrontation - but the situation is further complicated by the interference of England's sadistic king. Adventure, with Kirk Douglas, Tony Curtis, Janet Leigh, Ernest Borgnine and James Donald