Gwen and Heather

This is about the major conflict between Gwen and Heather.

Not So Happy Campers - Part 1
Sparks of the conflict began in this episode as the Screaming Gophers first walked into their cabins. After Gwen made a sarcastic remark at Heather, the latter retorted by giving her the nickname of "Weird Goth Girl", which she would use in reference to Gwen throughout the series.

Not So Happy Campers - Part 2
While not as prominent as the beginning of Heather and LeShawna's rivalry, Gwen fully agreed with LeShawna that Heather's refusal to dive off the cliff in their first challenge was ridiculous.

The Big Sleep
Heather insulted Gwen wich led to scowling between the girls.

Dodgebrawl
Heather and Gwen did not directly feud in this episode (Gwen was mostly too exhausted from the previous episode's challenge), but Heather allowed Gwen to get hit in the face with oatmeal fired by Courtney (who meant to hit Heather). Interestingly, when Noah criticized the lack of effort the team put in the challenge they just lost, Heather for once agreed with Gwen in wanting Noah to shut up, since he didn't even try to help the team out.

Not Quite Famous
The first major step of their rivalry originated in this episode. The challenge was a talent show and Heather declared herself team captain, much to Gwen's dismay who left with Trent to go to the Dock of Shame to get away from Heather and everyone else. Heather feeling threatened by her independence, becoming suspicious, found Gwen's diary and read it out for everyone to hear at the talent show, revealing her crush on Trent. Later, Gwen got revenge by dumping Harold's red ant farm on Heather (while sleeping), who ran out screaming. Gwen smiled and went to bed peacefully that night.

The Sucky Outdoors
Heather tells the rest of the team that Gwen for sure would be the next one to leave the island after what Gwen did to her the night before. Trent points out that Gwen's retaliation was justified, considering how severely she humiliated Gwen on national television. Heather refuses to acknowledge that she did anything wrong and swears that Gwen is going down.

If You Can't Take The Heat...
Gwen (along with Lindsay) could barely contain her laughter when Heather accidentally blew up a cake, which not only burned Heather's face, but completely burned away her eyebrows. Gwen was not active in tricking Heather into running into the freezer and locking her in, but she most likely got a kick out of it, since she showed no concern whatsoever about Heather being locked in the frigid freezer.

Who Can You Trust?
Gwen and LeShawna mocked Heather that morning, who was suffering from a cold after being locked in a freezer for so long in the previous episode. Heather vowed to get her revenge on Gwen (who, actually, had nothing to do with it.) Luckily for Heather, she and Gwen were partnered up for the first challenge, in which Gwen was to climb to the top of a mountain that had explosive dynamite and other various obstacles, while Heather had to hold the rope to keep her from falling. Heather dropped Gwen on her head (an accident), and later revealed her underwear to the world (definitely not an accident). Later, after Heather fell into the jellyfish pool and was relentlessly stung and electrocuted, Gwen was seen very content with this incident in the Confessional stall.

Brunch of Disgustingness
The teams were now dissolved into single-gender teams, and Bridgette, the only female Killer Bass member remaining, was the only new girl on her team. Heather began acting nice towards Bridgette, but to only get Bridgette in her alliance. Gwen told Bridgette to watch out for Heather, and the two exchanged looks while Bridgette, sheepishly, walked away. After arguing, Heather divided the cabin; one side being Lindsay and Heather's, the other being LeShawna and Gwen's. Bridgette ultimately chose Gwen and LeShawna's side. Later on, during the competition, Heather was notorious for pressuring the other girls to eat the disgusting meals (especially vegetarian Bridgette, who struggled with eating meat-based dishes), only to hypocritically chicken out on a number of meals herself. At one point, Gwen grabbed Heather in an attempt to force Heather to practice what she preached. At the end of the episode, Gwen and LeShawna lock Heather and Lindsay out of their cabin.

No Pain, No Game
There were brief moments where Gwen was specifically glaring at Heather from afar in the very beginning of the episode.

Search And Do Not Destroy
Heather spotted Gwen kissing Trent after he helped her out with getting her key. Considering the romantic relationship a rival alliance, Heather wanted a monopoly on all alliances and thus made a plan to break up Gwen and Trent. She had Lindsay forge a love note to Gwen that instructed her to meet him at the Dock of Shame at a specific time for a "surprise". Meanwhile, Heather lured Trent to the dock and proceeded to tell him several assorted lies about Gwen and how she "really" felt about him; Heather tricked Trent into thinking Gwen was only using him to get further in the competition, that she found him to be a cliché, and that his music sucked. Just as Gwen arrived to the dock, she saw Heather suddenly kiss Trent. Without even being noticed by Trent, Gwen ran off to the other side of the island to cry out her sorrows in seeing her mortal enemy kiss the one guy she cared for in the competition. Heather succeeded in turning the two against each other, though after all of that, Gwen still did not vote Trent off.

However, after Gwen told LeShawna her side of the story, LeShawna recruited nearly every camper into a temporary alliance to get rid of Heather or Trent; preferably Heather. Gwen did not know about this. Since Heather won invincibility, the vast majority of the campers voted off Trent. Heather revealed her treacherous scheme moments before Trent left the island, allowing he and Gwen to make amends. While they parted on a positive note, the end result was ultimately what Heather hoped for: making Gwen vulnerable by getting rid of her boyfriend.

Hide and Be Sneaky
Gwen is still depressed over what Heather did in the previous episode, but LeShawna promises they will get revenge on her. Shortly after Gwen is found by Chef Hatchet (in her grass camouflage), Heather announces that she has won invincibility again by finding Owen and DJ. Heather passes by Gwen, mocking her for how she looks in her camouflage outfit. Later on, Heather tries to get the girls to unanimously vote one of the guys off, as she became aware of their alliance and their plot to pick the girls off, one by one. However, Gwen and a few choice others refuse to agree on Heather's choice, making the plan to vote unanimously fail.

That's Off The Chain!
When a bird pooped on Heather's head, Gwen is satisfied, considering that it is just another way of karma getting back at Heather. Gwen was very pleased to see Lindsay curse Heather out after Heather betrayed her and ended up getting her eliminated. Heather reminds everyone that she gained invincibility for the third time in a row, and that no one can touch her. With a vengeful expression, Gwen points out that it was only for this particular week, and next time she may not be so lucky.

Hook, Line, and Screamer
Heather mocks Gwen and Duncan for their love of horror movies, finding it to be only mindless guts and gore. The two argue that it is actually filled with psychological trauma, using the terrified DJ as an example. Heather is the first one to ignore Gwen's lead on the situation of the challenge, which is to survive a real-life horror movie. Heather dismisses the challenge completely and heads off into the shower in spite of Gwen's warnings. This is one of the few episodes where Gwen shows a bit of actual concern for Heather's well-being (and vice-versa); first, when Gwen rushes into the bathroom when she heard screaming (which was actually DJ's); Heather assures Gwen that she is fine. Before leaving, Gwen sarcastically notes that Heather in her green face mask is a good look for her. Later on, when Gwen is unknowingly facing the real psycho killer, Heather and the others rush over to her to let her know what she is truly up against.

Wawanakwa Gone Wild!
The challenge was that the campers had to catch an animal that they randomly chose and could use anything in the boat house. Gwen had a duck and Heather had a bear, so they got in a tug-of-war fight over a net. Gwen then saw duck bait, so she let go of the net, causing Heather to fall and get stuck in a bucket of fish. Gwen taunted Heather as she was walking out, telling her that the net they were fighting over would never catch a bear anyway. When in the confessional, Heather spews that she's the favorite to win the entire competition because of the remaining campers on the island. When naming off everyone who's left, she calls Gwen "Weird Goth Girl", the usual nickname given to her by Heather. Later in the episode, Heather tells Duncan to scrub the shower with Gwen's toothbrush since LeShawna took many showers after falling in mud.

Camp Castaways
In the beginning of the episode, Heather and Gwen were sitting on the steps of their cabin when Heather begins taunting Gwen about LeShawna's elimination. Gwen then stomped on the stairs to mess up Heather polishing her toenails and told her to eliminate herself (Gwen: "Why don't you put us out of our misery and vote yourself off"). Later, they, Owen, and Duncan got stranded on a deserted island and Heather said in the confessional stall that she was with crazy people (referring to Gwen and Duncan). Gwen, trying to get back to the campsite, built a raft and started to sail away with Duncan, making Heather plead to go with them, but Gwen tauntingly dismissed her.

Are We There Yeti?
Gwen, Heather, Owen and Duncan all awoke in the forest, as the challenge was that they had to get back to the campsite, provided with equipment to help them (Chef Hatchet was in charge as Chris Mclean was away). Gwen and Heather were teamed up, and Gwen said in the confessional stall that she couldn't believe that the producers left her in the woods with Heather. Heather then said she would instantly ditch Gwen, but would keep her around so if a bear came, she could push Gwen for the bear to eat her. They argued, but eventually decided to work together so that they could win invincibility. Throughout the challenge, they kept on outwitting the boys and vice-versa. They had lost all their equipment to the boys and when they were walking, they both insulted each other on how they both smell. At the end, they manage to trick the boys by taking a page out of Heather's book by deceiving the boys into believing they were weak and helpless girls, and thus won the challenge, even high-fiving each other at the end.

I Triple Dog Dare You!
Gwen and Heather were bad mouthing each other in the confessional stall. Afterward, they went to the challenge, which was that they had to play 'I Triple Dog Dare You'. Gwen dared Heather to lick Owen's armpit, then Heather dared Gwen to chew and eat her toenail, slowly. After Gwen had to drink powder fruit punch from the communal toilets, Heather taunted her by saying that Trent would never want to go near her. Gwen then burped in Heather's face and teased her when she had to slurp jelly from Owen's navel. Eventually, Gwen and Owen teamed up when Gwen asked him to give half of his Freebies to her, and began whooping Heather with dares. After Heather was eliminated and had her head shaved, Gwen and Owen were relieved that they finally got rid of Heather after everything she had done.

The Very Last Episode, Really!
Heather tampered with the obstacles in Gwen's course in efforts to make sure she lost. She greased her pole (wiped off by Trent), gave her a fast-acting cupcake (eaten by Owen instead), and pulled Justin's shirt off (but it distracted Owen too). At the end, when the guys throw Chris into the water, Gwen asked Heather if she liked it. Heather first says no, but smiles and says yes. Gwen reminds Heather that she still stinks, however (LeShawna locked Heather in the confessional stall after Owen had used it when the cupcake he ate got through to him). In the alternate ending, Gwen invites every camper to her party except for Heather.

Total Drama, Drama, Drama, Drama Island!
Gwen was laughing at the back of Heather's head, which had a smiley face on it drawn by LeShawna, refused to team up with her and laughed when she was being attacked by beavers.

Monster Cash
Though Heather has been humbled by losing her hair (being forced to wear an ugly wig or else go about bald), she and Gwen are still bitter enemies as they even fight while trying to disembark from the bus when they arrive to the new location of the competition. Gwen and the other girls hate Heather to the point where they are determined not to share a bunk bed with her.

Riot On Set
Following LeShawna's advice to keep her enemies close by, Gwen reluctantly chose Heather to be a member of her team, the Screaming Gaffers (much to Heather's surprise).

The Chefshank Redemption
Gwen points out Heather's weaknesses, one of them being shameless flattery. Gwen throws barf at Heather's head after she got covered with it when Lindsay threw up all over her face. Heather becomes suspicious of Gwen when Gwen fakes a cramp and when the Killer Grips mention Trent. When it was revealed that the Grips won, Heather calls Gwen a traitor. While eating, Gwen and Heather glare at each other and snap insults like deathmask and smugness. Heather insulted Gwen when she was eliminated, saying that she lost, and was therefore a loser. She stated that Gwen's elimination meant that it was "the best day of her life". Gwen accepted her loss, but glared at Heather before leaving.

Opposite foils
Heather and Gwen are complete opposites of each other, thus making their rivalry more epic.

Similarities

 * They both have their stomachs revealed.
 * They both hate Justin, Courtney, and Katie and Sadie.
 * They were both Screaming Gophers and Screaming Gaffers.
 * They were both in the top three of Total Drama Island.
 * They are both hated by other campers in Total Drama Action.
 * They both have/had black or partially black hair.

Gwen

 * Gwen is the protagonist.
 * Gwen is kind and down-to-earth and for this reason, Gwen was liked by other campers.
 * Gwen likes Duncan, DJ, Trent, and LeShawna.
 * Gwen is honest.
 * Gwen has pale skin.
 * Gwen wears blue lipstick.
 * Gwen is a loner.
 * Gwen dresses like a goth.
 * Gwen hates girly trends and likes goth trends.
 * Gwen has short, choppy, artificially-dyed hair.
 * Gwen wears less revealing clothes.
 * Gwen wears long sleeves.
 * Gwen wears boots.

Heather

 * Heather is the antagonist.
 * Heather is mean and snobbish and for this reason, Heather is hated by other campers.
 * Heather hates Duncan, DJ, Trent, and LeShawna.
 * Heather is a liar.
 * Heather has tan skin.
 * Heather wears apricot lipstick.
 * Heather thinks she is popular.
 * Heather dresses like a top model.
 * Heather hates goth trends and likes girly trends.
 * Heather had long, solid hair.
 * Heather wears more revealing clothes.
 * Heather wears a sleeveless top.
 * Heather wears sandals.

Trivia

 * There is a connection between this conflict and the Heather-LeShawna Conflict.
 * This is possibly one of the biggest conflict of the series.
 * This conflict was the third conflict of Total Drama Island, as well as the first conflict of Total Drama Island to not involve Duncan (Duncan and Noah, Duncan and Harold).