In 2009, Mendler became a recurring character in the Disney Channel series Wizards of Waverly Place.
Mendler portrayed the role of Juliet Van Heusen, a vampire who later forms a romance with David Henrie's character Justin Russo.
This lasts till the series finale.
Mendler would go on to appear in eleven episodes total for the series, spanning from 2009 to 2012 when the series ended.
In 2010, Mendler became the star of the Disney Channel Original Series Good Luck Charlie, centering on a teenage girl who makes videos for her baby sister to watch as she gets older.
The series premiered on April 4, 2010, and was met with a positive critical reception and viewership.
In the third season, Disney Channel announced that the series would feature a same-sex couple.
This decision caused a protest from the conservative group "One Million Moms" asking Disney Channel not to air the episode.
One of Disney's spokespersons told TV Guide the episode was "developed to be relevant to kids and families around the world and to reflect themes of diversity and inclusiveness."
Disney aired the episode as planned.
Other people including actors Miley Cyrus and Evan Rachel Wood expressed their support.

In 2011, she starred as Olivia White, the lead role in the Disney Channel Original Movie Lemonade Mouth, watched by 5.7 million viewers on its premiere night.
Mendler performed numerous songs for the film's soundtrack, which was released on April 12, 2011 by Walt Disney Records.
The first single released from the soundtrack, titled "Somebody", was released on March 4, and peaked at number 89 on the US Billboard Hot 100 chart.
The second single, "Determinate", charted in numerous other countries and peaked at number 51 on the Billboard Hot 100.
In an interview with Kidzworld Media, Mendler confirmed that there will not be a sequel to Lemonade Mouth, commenting: "There’s not [going to be a sequel to Lemonade Mouth] unfortunately.
We had such a great experience working on the movie, and they tried to figure something out for a sequel, but everyone at Disney felt like the movie had completed its story in the first movie.
It was a great experience, and I loved working with the cast members and still see them frequently."
In 2011, Mendler had the supporting role of Appoline in the straight to DVD film Beverly Hills Chihuahua 2.
Mendler recorded the song "This Is My Paradise" for the film, which was released as a promotional single on January 11, 2011 with a music video directed by Alex Zamm.

On March 31, 2011, it was confirmed that Mendler had signed with Hollywood Records, and had begun working on her debut album.
Also in 2011 Mendler also starred the Disney Channel Original Movie Good Luck Charlie, It's Christmas!,
which premiered on December 2, 2011.
The song "I'm Gonna Run to You" was co-written and performed by Mendler, and was also featured in the film and released as promotional single on November 12, 2011.
Mendler later co-wrote and sang the Disney's Friends for Change Games anthem called "We Can Change the World", released as her third promotional single on June 11, 2011.
In 2012, she guest starred in the television series House as Callie Rogers, a homeless runaway teenager with a mysterious illness.
She also made a guest cameo in Canadian teen drama Degrassi in the Season 11 episode "Don't Panic (1)" as Clare and Alli's friend Emily Quagmire, in their civics class; she can also be seen in the show's opening sequence sitting on Jake's red truck alongside Alli and Clare.
She voiced the lead role of Arrietty in the American English dub of The Secret World of Arrietty, and she recorded a song "Summertime" for the movie which was released as a promotional single on February 2.
In 2009, Mendler became a recurring character in the Disney Channel series Wizards of Waverly Place. Mendler portrayed the role of Juliet Van Heusen, a vampire who later forms a romance with David Henrie's character Justin Russo. This lasts till the series finale. Mendler would go on to appear in eleven episodes total for the series, spanning from 2009 to 2012 when the series ended. In 2010, Mendler became the star of the Disney Channel Original Series Good Luck Charlie, centering on a teenage girl who makes videos for her baby sister to watch as she gets older. The series premiered on April 4, 2010, and was met with a positive critical reception and viewership. In the third season, Disney Channel announced that the series would feature a same-sex couple. This decision caused a protest from the conservative group "One Million Moms" asking Disney Channel not to air the episode. One of Disney's spokespersons told TV Guide the episode was "developed to be relevant to kids and families around the world and to reflect themes of diversity and inclusiveness." Disney aired the episode as planned. Other people including actors Miley Cyrus and Evan Rachel Wood expressed their support.
In 2011, she starred as Olivia White, the lead role in the Disney Channel Original Movie Lemonade Mouth, watched by 5.7 million viewers on its premiere night. Mendler performed numerous songs for the film's soundtrack, which was released on April 12, 2011 by Walt Disney Records. The first single released from the soundtrack, titled "Somebody", was released on March 4, and peaked at number 89 on the US Billboard Hot 100 chart. The second single, "Determinate", charted in numerous other countries and peaked at number 51 on the Billboard Hot 100. In an interview with Kidzworld Media, Mendler confirmed that there will not be a sequel to Lemonade Mouth, commenting: "There’s not [going to be a sequel to Lemonade Mouth] unfortunately. We had such a great experience working on the movie, and they tried to figure something out for a sequel, but everyone at Disney felt like the movie had completed its story in the first movie. It was a great experience, and I loved working with the cast members and still see them frequently." In 2011, Mendler had the supporting role of Appoline in the straight to DVD film Beverly Hills Chihuahua 2. Mendler recorded the song "This Is My Paradise" for the film, which was released as a promotional single on January 11, 2011 with a music video directed by Alex Zamm.
On March 31, 2011, it was confirmed that Mendler had signed with Hollywood Records, and had begun working on her debut album. Also in 2011 Mendler also starred the Disney Channel Original Movie Good Luck Charlie, It's Christmas!, which premiered on December 2, 2011. The song "I'm Gonna Run to You" was co-written and performed by Mendler, and was also featured in the film and released as promotional single on November 12, 2011. Mendler later co-wrote and sang the Disney's Friends for Change Games anthem called "We Can Change the World", released as her third promotional single on June 11, 2011. In 2012, she guest starred in the television series House as Callie Rogers, a homeless runaway teenager with a mysterious illness. She also made a guest cameo in Canadian teen drama Degrassi in the Season 11 episode "Don't Panic (1)" as Clare and Alli's friend Emily Quagmire, in their civics class; she can also be seen in the show's opening sequence sitting on Jake's red truck alongside Alli and Clare. She voiced the lead role of Arrietty in the American English dub of The Secret World of Arrietty, and she recorded a song "Summertime" for the movie which was released as a promotional single on February 2.
Bridgit Mendler