Sierra

Sierra, labeled The Obsessive Uber-Fan, is one of two newcomers, being one of the contestants on Total Drama World Tour. She was a member of Team Chris Is Really Really Really Really Hot before trading with Izzy. She is currently on Team Amazon.

Total Drama Action
Sierra, along with Alejandro, makes her debut in Celebrity Manhunt's Total Drama Action Reunion Special, where she flaunts her knowledge of the Total Drama series. She has created a blog for each and every cast member of the series and has been shown following them around. She is briefly seen during the report about Bridgette and Geoff's relationship problems, where she is seen getting her stomach signed by Geoff. Her cover is blown by Izzy in an interview, who reveals that she has been feeding Sierra this information so that she could get the RCMP off her back. Sierra gets a small job interviewing the cast on the red carpet, but Blaineley thought her questions were boring. Sierra was the one to encourage the contestants that they are not has-beens and tells them to stop Chris from doing Total Drama Dirtbags. She ends the show saying she is a third-generation Chris McLean scholar and can tell whether he is lying or not by his vocal tone and body language. She also knows where Chris shops for his clothing and the name of his three dogs. With an interest to finally answer all the blog questions on Cody, she wonders about things like the type of deodorant he uses and what song he sings in the shower and says it will be a "six-month analysis." However, Sierra ends up making the camera run out of battery with her long confessional.

Total Drama World Tour
In Walk Like An Egyptian - Part 1, Sierra is the last person to exit the bus, running out and exclaiming that it's her "best day ever." Sierra then notices Cody and rushes over to know him better, but is quickly Interrupted by Chris. Inside the Total Drama Jumbo Jet, while Chris is explaining the rules of the competition, Sierra is shown to be one of the only people to be listening. Heather expresses interest in starting an alliance with Sierra in this episode. While waiting to arrive in Egypt, Sierra states Cody's full name and reveals that he was born on April 1st. Sierra then attempts to flirt with Cody, saying that Cody is her own April Fool. During the Come Fly With Us musical number, Sierra sings with Cody. In the "Pyramid Over Under" challenge, Sierra forms a team with Heather and Cody, going under the pyramid. In the pyramid, Sierra almost injures Heather and herself by stepping on a loose step and making arrows shoot out of the wall. The trio later runs into Izzy, dressed up as a mummy. Sierra is later put into "Team Two". While deciding on the team name, Sierra shows some attraction towards Chris, naming her team "Team Chris Is Really Really Really Really Hot".

In Walk Like An Egyptian - Part 2, Sierra tells Izzy that Duncan and Courtney their fans will be disappointed on her blogs, but she and Owen have a chance of becoming the Total Drama power couple. Then, Sierra tell Izzy that Cody is hotter than Owen and he still sleeps with a stuffed emu. Sierra then rants about how Alejandro is not hot and sees the other girls as crazy for liking him. She goes through with Alejandro's plan on the goat. When she reaches the Nile, she tells everyone she's a fourth generation basket weaver which she is quick to build half of Teams Chris Is Really Really Really Really Hot's raft. Then, she and Izzy switches teams due to her wanting to be close to Cody. She then quickly builds Team Amazon's raft and manage to get help try to get the camel on. Once Team Amazon get's their camel onto their raft, they proceed to go across the Nile. Sierra and the rest of Team Amazon are the first to cross the finish line with the item they are supposed to bring, thereby escaping elimination.

Sierra is seen in Super Happy Crazy Fun Time Japan sniffing Cody's shoe, which the shoelace ends up getting stuck up her nose after Heather mentions her as a "friend". When Chris sends all of the contestants out of the plane, they sing Before We Die where Sierra mentions she wants to marry Cody. Cody participates in the human pinball challenge and Sierra is in it with him, rather than pandas for the other two teams. In the pinball, she kisses him all over his face. She says that if they got a point for every time she kissed him, they would be millionaires. Then in the second challenge, after Heather, Gwen, and Courtney fight, she and Cody created "Huh?" as their commercial, which ends up winning the challenge for Team Amazon. She proceeds to have a "group hug" with her team, but only hugs Cody and proceeds to block the rest of her team from the hug.

In the beginning of Anything Yukon Do, I Can Do Better, Sierra is seen with Cody in the winner's lounge, massaging his feet. After waking up from a peaceful sleep, Cody tells her that he doesn't like his feet touched, but Sierra proceeds to jab him in a pressure point, which temporarily paralyzes Cody. Sierra then listens in onto Chris in the commercial class area, and explains in the confessional that after viewing, reviewing and re-reviewing season one and season two, that when Chris says one thing, he means another. When everyone lands out of the plane and is together, Courtney mentions huddling together for warmth, where she grabs Cody and happily embraces him after Gwen rejects him. Then, when Chris explains the challenge in Yukon while drinking cocoa, she mentions that cocoa is Chris's second favorite drink, his first being tomato juice. When Chris asked how she knew this, Sierra explains she interviewed his school for a unauthorized biography. During the challenge, Sierra is seen saving Cody and Owen by throwing a ice block at a polar bear when it is about to eat them. She then uses a trout to paddle to Cody to rescue him after Owen pees in the water. When Sierra saves Cody, she realizes he needs warmth and needs to be on land, which then, she throws him back to shore, but unwittingly making him hit a rock, too. She then follows him using his footprints and both are rescued by Courtney, Gwen, and Heather. Suddenly, she and the rest of Team Amazon are singing back up to Stuck to a Pole, due to Chris' commands. She is seen last losing with her team to Team Chris Is Really Really Really Really Hot and Team Victory, when suddenly, Chris announces Team Amazon is in second place due to Bridgette not being with Team Victory and Team CIRRRRH placing first place.

Trivia

 * Sierra, along with Ezekiel and Alejandro, are one of the few contestants to use the confessional in a season that they did not participate in.
 * Sierra is currently the tallest female on the show, and the third tallest character overall (the first two being DJ and Geoff).
 * Sierra is the first and only contestant to make the camera in the confessional run out of battery.
 * Sierra is one of the two new coming contestants in Total Drama World Tour, the other being Alejandro.
 * Coincidentally, they both have dark skin,earings and necklaces, and both of their names are Hispanic. Alejandro's meaning "Alexander" and Sierra's meaning "hacksaw" or "chain of mountains".
 * Sierra's favorite cast member is Cody, as well as her crush. Sierra also may have a crush on Chris, judging by the name she choose for her team.
 * Sierra created the team name of Team Chris Is Really Really Really Really Hot.
 * Sierra is the only contestant to choose the team name by herself, due to the others being disagreeable about a team name.
 * Sierra is the first person Heather has tried to manipulate into an alliance with her in Total Drama World Tour.
 * Sierra is the first contestant to use 'text slang' in Total Drama World Tour.
 * Sierra is a fourth generation expert basket weaver.
 * Sierra is the second character in the Total Drama series to switch teams with Izzy, the first was Katie.
 * She is the only female contestant to compete in Total Drama World Tour not to compete in Total Drama Action.
 * In Anything Yukon Do, I Can Do Better, Sierra is shown to know the pressure points. She and Alejandro are the only ones to know them. Strangely, they are the two newcomers.