In the twelfth century, Geoffrey of Monmouth wrote a series of tales that we have come to know as Arthurian Legend. In the absence of proof, no one can say whether his stories were fact, based on fact or outright fiction. In "Friends of the Round Table," the mystery is solved when three adventurous adolescents vacationing in Cornwall, discover in a lakeside cave an ancient sword that they surmise can be none other than the legendary Excalibur. The sword immediately reveals its power by transporting them to sixth century Britain where the early days of the Dark Ages find the land to be a dangerous place of thieves, rogue knights and constantly warring kings. Gwen, Roger and Peter soon realize that Excalibur has a special purpose for them. Their mission involves helping a boy named Arthur to attain his kingdom and bring the country of Britain together as one nation so it will be strong enough to protect itself against the imminent invasion of Saxon armies.