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Scott and Stiles' close, unwavering friendship is known to be the main relationship in the entire Teen Wolf series, and though the two have gone through rough patches in the time they've been friends, they always come through it in the end with their bond even stronger than ever. They have been best friends at least since early childhood, and have been said to be inseparable by their respective parents, teachers, and mutual friends alike.
After Scott was bitten and turned into a Werewolf by Peter Hale in Season 1's Wolf Moon, Stiles became his closest confidante and was the main factor in helping Scott retain his humanity as he learned how to control his lycanthropy, along with help from Scott's then-girlfriend Allison Argent. In time, Scott and Stiles formed a two-person pack that would ultimately become the foundation for the McCall Pack, which grew to include nearly a dozen people, both supernatural and human, who have come and gone throughout the seasons. The two worked as a pair, with Stiles as the "brains" and Scott as the "brawn" in order to solve and deal with supernatural threats such as Peter's reign as Alpha, the Kanima, the Darach, and the Alpha Pack, gaining help from their friends Allison, Lydia Martin, Derek Hale, and Isaac Lahey, among many others. While under the influence of wolfsbane poisoning, it was Stiles who convinced Scott not to kill himself by setting himself on fire due to his belief that the constant death and harm caused to those around him was directly caused by his existence.
Throughout the second half of Season 3, Scott did everything in his power to save Stiles from his possession by the Nogitsune, and no matter how many people told him that the only way to prevent the deaths of innocent civilians was to kill Stiles, Scott refused to believe that Stiles couldn't be saved and ultimately found a way to free him from his possession. Scott and Stiles continued to protect and defend each other through other supernatural threats throughout the following seasons. Although their friendship was briefly broken due to the manipulations of Theo Raeken, it didn't take long before Scott and Stiles were working together again, eventually reconciling and teaming up once again to reunite the McCall Pack. Since Scott, Stiles, and the rest of the pack defeated the Beast of Gevaudan, the Dread Doctors, and Theo, Scott and Stiles' relationship is stronger than ever.
In Season 6, Stiles was abducted by the Ghost Riders of the Wild Hunt and was subsequently erased from existence, but even despite the fact that Stiles was removed from the memories of his loved ones, Scott, along with Lydia Martin and Malia Tate, quickly figured out that something was wrong based on the gaps in their memories. Scott then dedicated himself to figuring out who Stiles was, going so far as to nearly freeze to death in an attempt to trigger his repressed memories in hopes that by doing so, he could open a rift and bring Stiles back. The combined efforts of Scott, Malia, and Lydia eventually did just that, and Stiles played a major role in helping the pack defeat Garrett Douglas and the Ghost Riders. Afterward, when Scott, Stiles, Lydia, and Malia all graduated from high school, Scott and Stiles reminded each other that they both loved and needed one another despite the fact that they were going to colleges on opposite sides of the country.
Scott and Stiles are also known as Sciles (and are less commonly known as Skittles or McStilinski) by fans
It is unknown when exactly Scott and Stiles met, but they have known each other at least since the third grade, judging by comments made by Sheriff Stilinski, Melissa McCall, and Scott and Stiles themselves. According to Scott, the small scar on his cheek is from when he and Stiles were playing lacrosse in the McCall House when they were kids, during which time Scott dove to catch a ball Stiles threw toward him, landed on the glass coffee table, and shattered it, cutting his face and forcing him to get three stitches. ("Insatiable") They also apparently used to skateboard in the tunnels under the water treatment plant until Sheriff Stilinski caught them and forbade them from going back, suggesting that Scott and Stiles have been troublemakers from a young age. ("Ouroboros")
Throughout Teen Wolf
- Scott and Stiles' relationship is one of the longest-lasting friendships on the series, as they have known each other since they were children.
- Jackson Whittemore once called Scott and Stiles "Tweedledumb" and "Tweedledumber."
- Stiles gave Scott his Jeep as a goodbye present before the two left for their respective colleges, with Scott attending the University of California-Davis and Stiles attending George Washington University in Washington D.C.
- Scott and Stiles have "passed the baton" (or, in this case, Stiles' aluminum baseball bat) to Liam and Mason, who are effectively filling their places in the McCall Pack while the former two are in college.