Lancelot and his squire Brian are sent by King Arthur to carry a secret battle plan to Prince Boudwin, whose castle is under siege by King Mark. However, the two are soon captured by King Mark, who tries to get them to reveal the plan.
Although King Arthur has managed to arrange a truce between the battling Sir Bliant and Sir Rolf, Bliant's three sons break it by kidnapping Rolf's three daughters. Desperate to get his daughters back, Rolf comes to Arthur for help.
king Arthur and his forces set out to capture a band of pirates that are said to be hiding out in a town on the coast. In reality the pirates aren't in the town but are not far from the castle, waiting for Arthur to leave so they can sack it.
A knight wants to rescue a lady imprisoned by her brother, but believes he is too cowardly to do so on his own. He comes to King Arthur for help and advice on how to be brave and courageous. Merlin has a trick up his sleeve for giving the youth the confidence he needs to rescue the girl.
King Arthur banishes Lancelot from the kingdom because he believes that Lancelot made a false accusation against King Marhaus. Outside the kingdom, however, Lancelot runs into Marhaus and uncovers an evil plot.
At the invitation of King Boltan, who tells then that his daughter, Iolta, has been abducted by ghostly warriors dressed in Roman attire, Lancelot and Brian scale a high boundary wall and discover a sign which says 'Rome - 1,200 miles'.
A band of renegade knights is preying on the shepherds in the area. Sir Lancelot decides to champion the shepherds' cause, and masquerades as a shepherd to teach them how to fight the knights off. Guest star: Jennifer Jayne.
As punishment for rebelling at working with Merlin's pigeons, Squire Brian is sent on an errand delivering a crate of pigeons to a neighboring castle. En route, he becomes involved with a gang of thieves who stole the precious Ruby of Radnor. Guest stars: Colin Tapley as Everard, Edward Judd as Garth, Eric Corrie as Robert, Reginald Hearne as Hugo, Harold Goodwin as a peasant
King Arthur learns that a nearby village is being terrorized by a horrible monster. Sir Lancelot is sent to investigate. He discovers that the monster is really a Viking boat, and that it's the Vikings who are doing the terrorizing. Guest stars: Ann Stephens as Sella, Gerard Heinz as Eck, Wilfred Brambell as a fisherman.
King Arthur gives Sir Lancelot a new name and sends him off to champion a lady who is being forced into marrying an unscrupulous man. Guest stars: Virginia Vernon as Lynette, Hector Ross as Baron Brayor.
A young girl asks Sir Lancelot's aid. An evil monarch, King Meliot, is selling the young men of the village of Cheddar into slavery. Guest stars: Patricia Kneale as Ellen, Edward Judd as James, Eddie Malin as Paul, Reginald Hearne as the Chamberlain.
Sir Richard is about to marry Lady Margaret, but on his way is waylaid and left for dead, as a double arrives in his place. The double is Sir Alfred, son of scheming Sir John. When Lancelot arrives, he soon suspects the plot.
The Lady Lilith has been running the castle of Goodhue since it was left to her by the late Sir William when she was 14-years-old. Sir Liones petitions for a ruling at the court of the king because the law says that no property can be inherited by a woman. Facing a difficult choice, the King Arthur suggests the best solution would be for Sir Liones to marry the Lady.
While preparing for knighthood, Squire Brian uncovers a plot by King Marhaus of neighboring Mercia. The king wants it to appear that the villagers of Poltifax have violated a treaty over the use of their bridge so that he will have an excuse to invade their town. Zena Walker as Angela, Derek Aylward as King Marhaus, Jack May as Caradoc, Eric Corrie as the Priest, Edward Judd as Sir Grint.
While on a visit to castle Lamorack, Sir Lancelot and Merlin try to help their host when he receives a note threatening his daughter's life. Merlin learns that the note is false, written by the girl herself in a bid for attention. Later, the girl disappears and another note arrives; this time it's genuine. Guest stars: Carol Marsh as Sybil, Jeanette Hutchinson as Amora, Hector Ross as Sir Egbert.
After the death of a knight of the Round Table, a young man enters a tournament that will decide who will fill the vacancy. But the other knights object to the young contestant because of his shabby appearance. Sir Lancelot intercedes for him. Guest stars: Alison Leggatt as Morgana Le Fay, Robert Hardy as Rupert, Derek Waring as Balin, Reginald Hearne as Sir Julian, Edward Judd as a sentry.
When a king breaks a treaty between his country and a tribe of women, his sister is taken hostage. Sir Lancelot sets forth to rescue the princess. Guest stars: Mary Steele as Anne, Linda Gray as Marta, John Horsley as Athelred, Reginald Hearne as Evanston, Mary Manson as Helga.
While visiting Mortaise Castle, Queen Guinevere is presented with a priceless jewel from the Rajah of Kaipur. Shortly afterward there is a fire, and during the excitement the jewel is stolen. Guest stars: Martin Benson as Hassin, Chin Yu as Vuleika, William Franklyn as Baron Mortaise, Eric Corrie as Osbert, Edward Judd as Ronk.
Attempting to show King Arthur how difficult it is to honest employment once a man has been branded a thief, Lancelot persuades the King to join him in the streets . Disguised as robbers , they enter a den of thieves - and find trouble in abundance.
Lancelot and Brian head off to Ireland to compete in a tournament representing King Arthur. On the way, they come across a rhyming bandit or so they think. His story is not the standard having been banned by the kingdom due to his explicit and confronting lyrics. His enemies want nothing more than for him to be killed, but the princess has fallen deep in love with him and his sweet poetry. Lancelot sees to it to bring back together a couple that obviously loves each other. But there are of course obstacles.