Acting
In 2002, Stoner became the co-host of the Disney Channel Mike's Super Short Show along with Michael Alan Johnson, an infomercial segment regarding forthcoming Disney releases. In 2003 and 2005, they appeared as Sarah, one of the twelve Baker children, in the successful comedies Cheaper by the Dozen and Cheaper by the Dozen 2. They have also appeared in several television shows aimed at the preteen audience, including The Suite Life of Zack & Cody, That's So Raven and Drake & Josh.
In 2006, they had a small film role in Step Up as Camille, Channing Tatum's character's younger foster sister. They provided the voice of Isabella Garcia-Shapiro and Jenny (until Season 4) in the Disney Channel animated series Phineas and Ferb from 2007 to 2015. In 2008, they starred in the Disney Channel Original film Camp Rock as Caitlyn Gellar, an aspiring music producer. Their reception in Camp Rock was particularly strong, with various media outlets suggesting it was about time they played a main character role having backed up for other big names such as Will Smith and Eminem. Stoner starred as Alice McKinley in the film Alice Upside Down, based loosely on the Alice series, particularly The Agony of Alice by Phyllis Reynolds Naylor. This was their second starring role and, according to an interview that appears on the direct-to-DVD release, they stated that this was the first time they had to appear in every scene in a film.
In 2010, Stoner appeared in the third Step Up film Step Up 3D opposite Adam Sevani where they reprised the role. Stoner uploaded a video onto their official YouTube page of their final dance rehearsal which introduced other cast members. The same year, Stoner returned to reprise their role as Caitlyn Gellar in Camp Rock 2: The Final Jam, a sequel to Camp Rock. Stoner also guest-starred in the television drama series House as a skater.
They also appeared in Wii Fit related videos on the Nintendo Channel on the Wii video game console demonstrating balance exercises. Stoner replaced Hayden Panettiere as the voice of Kairi in Kingdom Hearts Re:Chain of Memories, Xion in Kingdom Hearts 358/2 Days, and both characters in Kingdom Hearts III. They voiced the character Opal in seasons three and four of The Legend of Korra.
