Duncan is a major character from the Total Drama Series, a delinquent punk currently on parole from Juvie. He frequently bullies many of the other contestants, especially Harold and Trent, and is supposedly a certified Pyromaniac. In Total Drama Island, he was on the Killer Bass team, in Total Drama Action he was a member of the Screaming Gaffers, and in Total Drama World Tour he quit before the teams were made, But was on "Team Chris is Really Really Really Really Hot" after returning in I See London.... He was one of two possible winners of the Total Drama Action season, and is the overall highest ranking contestant across the three seasons, his absence for the first half of Season 3 notwithstanding. Duncan had a prominent, longtime love-hate romantic relationship with Courtney, which completely fell apart because of their abusing relationship, and became a hostile rivalry in World Tour (see below).
In Total Drama Island, Duncan bullies many people and is responsible for some eliminations (Bridgette, Tyler, etc.). In most times, he, along with two of his best friends Geoff and DJ, would often bully Harold to the point of him getting revenge by getting Courtney, his love interest, eliminated. Since the season one special, his relationship with Courtney slowly becomes an abusive one, due to her ditching him for the million dollars.
In Total Drama Action, he becomes close friends with Gwen, and caused Trent's mental breakdown after combining his and Gwen's names together, forming "nine". This made Trent obsess over Gwen until his elimination, to the point where the couple broke up due to Trent's health problem with the competition, as well as Gwen not wanting to cheat. He is also one of the two people directly responsible for Gwen being hated by most of the contestants, the other being Justin. Throughout the season, Duncan started causing eliminations of some contestants (Bridgette, Geoff, Trent, LeShawna, Justin, Lindsay, Harold, and Courtney). Also during this season, he is mostly the victim of beatings, orders, and being used by none other than Courtney, who was suppose to be his love interest, but she lost respect for him she had in Season 1. He won Total Drama Action at the end after a popular fan-vote was done online. Despite being a winner, he returned to Total Drama World Tour.
In the first episode of Total Drama World Tour, Duncan quits the show because he refuses to sing, and afterwards is reported as missing on the Aftermath show. Later, he is found by Courtney and Gwen in London during a challenge to capture Jack the Ripper (actually Ezekiel), and forced to return to the show by Chris McLean. Immediately after returning, Duncan apparently is no longer attracted to Courtney because of everything she has done to him since the Season 1 special, and gets revenge on her by cheating on her with Gwen in the bathroom confessional with the intention of starting a relationship, but they are caught in the act by Tyler, who reveals what happened to the rest of the contestants in the next episode due to pressure from Alejandro, who discovers Gwen and Duncan's secret by overhearing a musical number between them. Courtney is so shocked by the news that she goes insane with revenge, vowing to destroy Gwen to the point of sabotaging her own team. Cody, Gwen's one-sided love interest, punches out Duncan in response. Although Duncan does attempt to apologize to Courtney immediately after this with emotional music in the background, only to be kicked in the balls mid-sentence, he has shown no remorse after this point and he and Gwen embrace their sinful affair while making no further attempts to apologize to Courtney, because of everything she has put the both of them through, through humiliation, hatred, and threats. This, along with the ever-manipulative Alejandro encouraging her to take revenge, makes Courtney even more infuriated, leading to her brutalizing Gwen during the Area 51 challenge and "flirting" with Tyler in order to make Duncan jealous as revenge. Duncan is largely unaffected by this and doesn't seem to care much about what is happening to Gwen.
In the next episode, Duncan starts secretly working with Alejandro to throw Courtney off, and pretends to feel sad about her. During the challenge in Australia, Duncan and Cody fight while riding on kangaroos and as revenge, Duncan throws a Dingo at Cody towards the end of the episode, injuring him and causing his team to lose. However, while doing all this Duncan did not consider Gwen, who was upset when she saw him crying over Courtney and had put together her own plan to get rid of Courtney and save herself, which would have worked if Duncan hadn't thrown the dingo at Cody, who was going to vote for Courtney but ended up accidentally voting for Sierra instead due to being in a daze from his injuries. Gwen and Courtney end up competing in a tiebreaker challenge, which Gwen loses due to the challenge being rigged that leads to an allergic reaction, which leaves her eyes swollen shut and her face mauled as she takes the Drop of Shame. Gwen gives Courtney one final, insult as she plummets, presumably referring to the fact that she still has her former boyfriend despite being defeated... although Duncan does not seem to be there for Gwen as she leaves the show broken and humiliated.
In the following episode, Duncan shows little remorse or concern for his lover, but still does not want to take Courtney back and they are now both openly hostile to one another. In the episode after that, they are "married" as part of a challenge and still show nothing but hatred for each other. Courtney is finally eliminated, much to Duncan's pleasure, in the China episode, but finally meets his end not long after when Alejandro finally betrays him, and along with Heather allows Duncan to be brutally beaten by the feral Ezekiel during the African Safari challenge, after which he is eliminated.
Duncan is last seen in the peanut gallery with all the other losers during the finals, including Gwen, whom he is frequently seen next to, inferring that they are still together despite after what happened in Australia. Thus, the two presumably live ever after, assuming they didn't die from the volcano in the finale (it's also been hinted that nobody cared about them cheating on Courtney due to everyone's hatred for her for what Courtney has put them through). In March of 2011, a never-before-seen clip surfaced in the Polish version of the show, in which Duncan and Gwen are seen relaxing together in Hawaii after their eliminations. Courtney starts singing rudely about them after insulting Cody and Heather, and Duncan threw a sandal at her before making out with Gwen again, confirming that they are indeed still a couple, despite what happened during their times together on the show.
All these events have make Duncan's character extremely controversial in the fandom. Many have noted his apparent lack of concern for Courtney during Season 3 even prior to her going insane, as well as his continued hostility to her afterwards (despite Courtney doing the same to him), and claim that he intended to hurt her from the start, and would have left her for Gwen even if she had reacted differently. This is apparently due to the fact that due to everything that Courtney has pulled him through in Total Drama Action, and finally opens his eyes to who his girlfriend really is and all she's done to him, he, infact, no longer cares for her any longer. His lack of protection for Gwen, and the fact that he suffers the least of the three overall have also led to much criticism. Some go as far as to say that Duncan was fully responsible for the entire conflict, including all of Courtney's actions and Gwen's suffering.