Gawain is a knight in Britain.
During the events of Camelot: Season 1 Episode 3 Guinevere played by Clive Standen
Kay and Leontes find Gawain in an old church and they initially fight each other. They tell him about King Arthur defeating King Lot and pulling the sword from the stone. Kay finds Gawain's book and finds out that Gawain has trouble reading. As Kay and Leontes are leaving, Gawain offers to join them if Kay teaches him how to read. Gawain goes to Camelot and meets Arthur.
During the events of Camelot: Season 1 Episode 4 Lady of the Lake played by Clive Standen
The day after the wedding, Gawain asks Arthur what he and his warriors are fighting for and Arthur tells him freedom. Gawain tells Arthur to show him how he fights, easily beats him and breaks Arthur's sword. Merlin says that Arthur needs a sword fit for a king and Gawain suggests he get a sword from Caliburn. Gawain continues to train Arthur's warriors and while training Kay, cuts him in the arm with a blade on his shield. As Arthur chastises Gawain, Gawain pulls out a knife and puts it to his throat. Kay, Leontes, Brastias, and Ulfius pull their swords on Gawain, who releases Arthur. During the night, Arthur asks Gawain how he will know when it is time to give up. Gawain tells him that the warrior would never give up and when he has nothing to lose, he will risk everything. Arthur goes to the training grounds and challenges Leontes to a fight as the other warriors watch. Leontes wins, but when he is walking away, Arthur kicks him in the back and puts a knife to his throat and says to never give in. Merlin returns with the sword and tells the others that he found Caliburn dead and rode to a lake where he saw an arm sticking out of the lake holding the sword and that its name is Excalibur.
During the events of Camelot: Season 1 Episode 5 Justice played by Clive Standen
Arthur's tribunal starts and Ewan is the first to speak and says that Wade was a good man, while Colfur is a trouble maker. Arthur asks Ewan why the fight started and Colfur tells him that he hit Wade first. Ewan says that Colfur rented the land and owed tithes. Colfur refuses to answer why he attacked Wade and Arthur calls for a break in the tribunal. Gawain and Leontes believe Colfur is guilty, but Kay thinks there is something else going on. The tribunal begins again and Colfur tells the whole story and he is banished from Exham. As Gawain is helping Colfur and Katelyn move, Ewan and a group of men confront them. Ewan attacks Gawain and a fight starts. Arthur, Kay and Leontes arrive to help Gawain. Arthur defeats Ewan's men and declares to the villagers that they are now under Camelot's protection.
During the events of Camelot: Season 1 Episode 6 Three Journeys played by Clive Standen
Brastias, Ulfius, Leontes, Gawain and Kay are putting up banners with the Pendragon logo on them when Merlin rides up and tells them that they are going to Kay's old home to retrieve Ector's books. As Merlin and the others are riding, they come across a camp that was attacked. They find Herlewin still alive, but his wife dead. Merlin tells Herlewin that he is dying and Kay asks Merlin to use his powers. Merlin refuses to and Gawain snaps Herlewin's neck. Merlin explains his powers to the others and how using magic comes with a cost. Kay and the others ride into Kay's old home and find it plundered and the books gone. Merlin tells Gawain that his powers bring him into the dark, but Gawain tells him that he must use his powers just like they do. Kay has a dream of Ector reading to him and Arthur and when he wakes up, sees a spectral image of Ector. He follows the image which leads him to a hidden basement and the books. Kay and the others pack the books up and ride back to Camelot. As Leontes is riding, he is thrown from his horse and dislocates his shoulder, Merlin uses magic to distract him and Gawain puts his arm back into its socket.
During the events of Camelot: Season 1 Episode 7 The Long Night played by Clive Standen
Arthur, Kay, Igraine, Merlin, Guinevere, Leontes, Gawain, Brastias, Ulfius, and Bridget ride to Morgan's castle. During the feast Arthur's men get drunk and Morgan offers her love and devotion to Arthur. Dancers start dancing in front of the group and at the end of the dance stick swords in front of the diners. The Dancers leave with most of Arthur's men except, Arthur himself, and Leontes. After dinner, Gawain goes back to watch over Arthur and the castle suddenly is attacked by flaming arrows. A Girl is surrounded by flames and Arthur goes to save her. Everyone gathers for a meeting and Morgan wonders who is attacking her and Merlin thinks Aldwulf, a warrior king from the east might be behind the attack. Gawain gets Morgan's forces ready. Harwel, who was part of the scouting group, returns wounded and says that Aldwulf is preparing to attack. Morgan sends some of her soldiers out of the castle, leaving even fewer people to defend the castle. Guinevere offers to fight and Brastias and the other warriors help her, Bridget and the Dancers how to fight. Gawain is about to leave when Leontes orders him to stay, they start fighting, but are stopped by Arthur. Leontes tells Gawain that during a battle he killed a boy and later asked God for forgiveness. In the morning, Morgan's Captain returns and says that they defeated Aldwulf's men. Arthur and the others ride back to Camelot.
During the events of Camelot: Season 1 Episode 8 Igraine played by Clive Standen
While Arthur, Kay, Gawain, Leontes, Brastias and Ulfius are riding, Brastias tells them one of the Dancers told him that she would visit him. They separate into two groups to go hunting and decide to have a competition on what group catches more food. Arthur and Leontes shoot come pheasants, while Gawain, Brastias and Ulfius catch a stag. Arthur and his group discuss having a representative from each villager that can represent their village's cause to Camelot. During the night, Leontes is woken up by a large snarling wolf. In the morning, he tells the others about the wolf and tells them that the wolf spared him, because it has a purpose for him.
During the events of Camelot: Season 1 Episode 9 The Battle of Bardon Pass played by Clive Standen
Arthur orders Kay, Gawain, Ulfius and Brastias to assemble. Merlin tells Gawain to protect Arthur if Leontes tries to harm him and Arthur and his men head to Bardon Pass. Albion shows Arthur and his men a secret way to Bardon pass and Brastias is almost struck by Griffith, who thinks he is the enemy. Arthur then meets Lucan. Guinevere rides to Bardon Pass and Kay figures out that Arthur cheated with Guinevere. Arthur then admits to it to the others. Wallace gives Arthur the chance to surrender, but Arthur refuses. Harwel and the mercenaries attack and Mercenary 4 attacks Guinevere, but is killed by Leontes. Hilda is shot by an arrow during the attack. Harwel calls for a retreat, but before they do, Ulfius is killed and Kay is shot by Harwel with an arrow. Arthur tells the others to retreat while he stays behind.
During the events of Camelot: Season 1 Episode 10 Reckoning played by Clive Standen
Gawain and the survivors of the battle of Bardon Pass arrive at the location where they are to rendezvous with Arthur. Leontes tends to Kay's wound and he and the others realize that Arthur stayed behind to prove himself to them. Back at Bardon Pass, Arthur and Leontes are surrounded, but are then joined by the rest of Arthur's men. Harwel's men retreat and as Harwel is about to shoot Arthur with an arrow, Leontes gets in front of the arrow. Gawain kills Harwel and Leontes tells Arthur to treasure Guinevere and then dies.
Arthur returns with Leontes' body and Guinevere cries. Morgan is about to be crowned queen when Arthur walks into the throne room. Morgan runs to him as if she is happy to see him, but Arthur chastises the people for so quickly crowning a new leader and Merlin is released. Borin asks where Arthur was and Arthur tells Morgan to give him back his sword and crown. Morgan says he has lost the will of the people, but Brastias takes Arthur's sword from Vivian and the crown from Sybil. Gawain and Kay drag Wallace into the throne room and Wallace tells the crowd of Morgan's plan. Sybil tells everyone that she planned everything and Morgan knew of nothing. Gawain takes Sybil to her execution spot and before Gawain cuts off her head, Merlin tells her that there is no god. Leontes' body is put on a funeral pyre along with Igraine's. The wood used to carry Leontes' body is made into part of a round table.