This week on Rex Factor we put right what once went wrong and step back 1,000 years in history to review England's first Viking ruler, Sweyn Forkbeard. Sweyn was the father of the legendary Cnut and the first Viking to be acknowledged as full king of England when he forced Aethelred the Unready from the throne in 1013, adding to his crown in Denmark and overlordship of Norway and Sweden. So why did he get missed out the first time round? Will his patience be rewarded with the Rex Factor? For one episode only, slip back into the Vikings and prepare for big battles, cool names and the best Rex Fact to date!