Gwen and Sierra

This article focuses on the interactions between Gwen and Sierra.

Overview
The conflict between Gwen and Sierra is mostly one-sided on Sierra's side, due to her extreme jealousy of Cody's feelings for Gwen, as well as her disgust about Gwen's actions during the season. It reached a high point after the events of Greece's Pieces, when Tyler revealed that Gwen and Duncan kissed, a revelation that intensified during The EX-Files, and ultimately ended in Sierra helping to vote Gwen off one episode later.

Super Happy Crazy Fun Time Japan
Gwen, along with Heather and Courtney, are grossed out after watching Sierra sniffing Cody's shoe. After winning the challenge, Sierra calls for a group hug, but then tells Gwen, Courtney, and Heather to "back off."

The Am-AH-Zon Race
Gwen is freaked out by Sierra when she uses a pizza box as a laptop and an actual mouse and quickly rejects Sierra's offer to share it with her. When Chris asks for a team member to carry Cody's epipen, Cody begs Gwen to take it instead of Sierra, which she has to agree, much to Sierra's discomfort, claiming she knows more about Cody's life threatening allergies than anyone. When they are caught by the Zing-Zings, Heather orders Gwen to reach into Cody's pockets for the lantern's batteries. Sierra complains about not being the one reaching Cody's pockets. Later, Sierra is annoyed by Gwen's snores, claiming they were driving her crazy. After the team lost the challenge, Sierra and Courtney glare at Gwen when she wakes up and asks for the results. Like Heather, Sierra thinks Gwen is responsible for jinxing the team. She then agrees to vote Heather off for their loss, if Gwen promises to stop being nice to Cody because of Sierra's attraction.

Can't Help Falling in Louvre
After hearing Sierra cry throughout the first challenge, Gwen furiously yelled that she couldn't take it anymore, and left Sierra behind with Cody.

Greece's Pieces
After learning about Duncan and Gwen's kiss, Sierra sides with Courtney by ordering Cody to lose the challenge so that the team could eliminate Gwen.

The EX-Files
In this episode, Sierra is still shown to have developed a hatred towards Gwen, along with Courtney. She makes a paper cut-out of Gwen and then bites its head off, while singing the nursery rhyme Rock-a-bye Baby; "the cradle will fall, and down will come Gwen!" Later, in the confessionals although she says that she saw Duncan and Gwen's attraction coming since season one, she still believes that stealing other girls' boyfriends is wrong. She even seems as furious at Gwen as Courtney. When a lizard climbs up Heather's leg and everyone ends up in the middle of the minefield, Sierra immediately blames Gwen for leading them to the trap, labeling her as the "New Heather" (even though it wasn't her fault). Though she doesn't sing in Boyfriend Kisser, she does make a line about how obvious Gwen and Duncan's attraction was. At the base, none of the team is able to find an artifact, until Gwen finds the alien cube. Sierra and Courtney are the only ones upset at her, seeing as how she won the challenge and made herself safe.

Picnic at Hanging Dork
At the first class section, Sierra and Courtney keep staring at Gwen, even not bothering Cody for a while. Sierra joins Courtney's alliance to vote Gwen off. Additionally, Gwen tried to be in an alliance with Cody, telling Cody she would help get Sierra voted off if he joined forces with her.

Sweden Sour
Sierra states this day is the best, as Gwen is finally gone. She appears in the confessional saying that she's happy about Gwen's elimination, even saying that Gwen was her foe, and that Cody can finally remember who his true love is, while pointing at herself. She adds that Cody probably already forgot about Gwen, even though the exact opposite was apparent. Sierra is also mad that he'd constructed a huge wooden replica of Gwen's face in Gwen's Face.

Awwwwww, Drumheller
When Cody started talking in his sleep and revealing that he was having a dream about him and Gwen, Sierra quickly and rudely woke him up. When he asked what happened, she told him that he was having a nightmare.

The Am-AH-Zon Race
Despite being jealous of Gwen, and being mad at her for cursing the team with her good luck prediction, Sierra agrees to vote Heather off instead of her, on the condition that she wouldn't interfere with her and Cody.

Greece's Pieces
Prior to discovering the kiss, Sierra does acknowledge and appears to approve of the "Gwuncan" relationship, even stating that it has existed in the series since the first season. Also, once Courtney found out about the kiss, Sierra physically restrained her from attacking Gwen and had a genuine look of concern on her face.