《圣城风云》描述乌瑟王暴毙之后，大法师梅林从民间寻回乌瑟王的私生子亚瑟，将他扶上王位。梅林希望亚瑟能统一四分五裂的帝国，但亚瑟同父异母的姐姐、女巫摩根·勒菲却从中作梗。与此同时，初来乍到的亚瑟与美貌的金发少女格温娜维尔坠入爱河。

亚瑟的父母在他小时候被拿古比害死，亚瑟则由于梅林帮助而生还。梅林把亚瑟交给艾古达照顾，之后亚瑟长大参加了众王拔出石中剑的集会，亚瑟拔出了石中剑然后在集会中证明自己是尤谢尔王的儿子，因此成为一国的领袖。其后认识不少骑士且与他们组成圆桌骑士，为了打倒拿古比而战。

The Adventures of Sir Lancelot is a British television series first broadcast in 1956, produced by Sapphire Films for ITC Entertainment and screened on the ITV network. The series starred William Russell as the eponymous Sir Lancelot, a Knight of the Round Table in the time of King Arthur at Camelot.

This 8-part drama brings high romance, low treachery and magical adventure via a host of legendary characters: wise old Merlin, brave Sir Lancelot, King Arthur, ruler of all Britain and master of the Knights of the Round Table, the beguiling Queen Guinevere and her nemesis Morgan la Fay. Dark Ages wizard Merlin (Robert Eddison), weary of the barbarism around him, creates a new order of enlightenment and justice with a youthful Arthur (Andrew Burt) at its head. Merlin gifts Arthur with the magic legendary sword Excalibur to help him defeat the nobles who oppose his rule. But Arthur must also beware his half-sister Morgan (Maureen O'Brien), a sorceress who has sworn to kill him to avenge her father's death. As Morgan intensifies her plans to get revenge, she uses magic to draw Lancelot (David Robb) and Guinevere (Felicity Dean) into a passionate affair. But it is the still more traitorous Mordred (Steve Hodson) who will fatally halt Arthur's rule.

In this off beat account of King Arthur's quest for the Grail, virtually every journey, battle or adventure is stopped dead in its tracks by the knights of the round table's most worldly traits : cowardice, greed, idiocy or misplaced chivalry. As a consequence, instead of epic adventures we are treated with the characters' pragmatic and anachronistic take on each and every event in the Grail legend, true to the purest sitcom tradition.