Olesya Rulin (Russian: Oлeся Pулин; born March 17, 1986) is a Russian American actress. She is best known for co-starring in the first three films of the High School Musical franchise as Kelsi Nielsen. She also starred in the films Private Valentine: Blonde & Dangerous (2008) and Flying By (2009).

Rulin was born Olesya Rulinkova in Moscow, Russian SFSR, Soviet Union. She spent her early childhood in the Likhoslavl(Population: 12,000) located three hours north of Moscow. She was eight when she migrated to the United States to rejoin her father who had done so two years earlier. They lived first in Texas then later in Utah. She can read, write and speak in fluent Russian. She is also a trained ballet dancer. When she was 12, she entered a model search contest at the urging of her mother and won representation by four different agencies. Prior to acting full-time, she worked for a year as a certified nursing assistant and also at stores such as Victoria's Secret; she was working at a Nordstrom store when the first High School Musical came out. She was studying economics in Paris when the casting for High School Musical 2 was being done. Rulin graduated from West Jordan High School in 2005.

Kristin Chenoweth (born July 24, 1968) is an American singer and actress, with credits in musical theatre, film and television. She is best known on Broadway for her performance as Sally Brown in You're a Good Man, Charlie Brown (1999), for which she won a Tony Award, and for originating the role of Glinda in the musical Wicked (2003). Her best-known television role is Annabeth Schott in NBC's The West Wing. As Olive Snook on the ABC comedy-drama Pushing Daisies, she won a 2009 Emmy Award. Chenoweth stars in the ABC TV series GCB, which premiered in March 2012.

An Oklahoma native, Chenoweth sang gospel music as a child and studied opera before deciding to pursue a career in musical theatre. In 1997, she made her Broadway debut in Steel Pier. Besides You're a Good Man, Charlie Brown and Wicked, Chenoweth's stage work includes five City Center Encores! productions, Broadway's The Apple Tree in 2006 and Promises, Promises in 2010, as well as Off-Broadway and regional theatre productions.

Chenoweth had her own TV series Kristin in 2001, and has guest starred on many shows, including Sesame Street and Glee, for which she was nominated for Emmy awards in 2010 and 2011. In films, she has played mostly character roles, such as in Bewitched (2005), The Pink Panther (2006) and RV (2006). She has also played roles in made-for-TV movies, done voice work in animated films and the animated TV series Sit Down, Shut Up, hosted several award shows and released several albums of songs, including A Lovely Way to Spend Christmas (2008) and Some Lessons Learned (2011). Chenoweth also penned a 2009 memoir, A Little Bit Wicked: Life, Love, and Faith in Stages.

Adrienne Monique Coleman (born November 13, 1980) is an American actress, dancer, entrepreneur, and philanthropist best known for her co-starring role in Disney's High School Musical movies, in which she plays Taylor McKessie. Coleman also had a recurring role on The Suite Life of Zack & Cody, as a school girl named Mary–Margaret. She also competed in the third edition of ABC's Dancing with the Stars, finishing in fourth place. Most recent, Coleman was named the first ever UN Youth Champion for the International Year of Youth and is currently on a world tour to raise awareness of challenges facing youth. Coleman launched her online talk show Gimme Mo', a show dedicated to empowering today's youth on September 8, 2010.

Coleman was born Adrienne Monique Coleman in Orangeburg, South Carolina. She started her acting career in theatre and television at a very young age in Columbia, South Carolina. She currently lives in Los Angeles. Her training began at the Workshop Theatre School of Dramatic Arts where she performed in over 15 plays. An acting class taught by a guest teacher actually turned out to be an audition, and resulted in her booking her first commercial. Then Coleman began auditioning for anything she could in the Southeast region, landing several local and regional commercials, as well as a few supporting roles in films. In addition to acting, Coleman was very involved in her community and school where she did everything from performing in plays to competing in forensic tournaments, volunteering with abused children, running track, and even cheerleading .

Kaycee Stroh (born May 29, 1984) is an American actress, singer and dancer, best known for her roles in the hit Disney Channel Original Movies, High School Musical, High School Musical 2 and High School Musical 3: Senior Year. She was a contestant in the VH1 reality show Celebrity Fit Club.

Stroh appeared in High School Musical, High School Musical 2 and High School Musical 3 as smart girl Martha Cox, who secretly loved to "pop & lock & jam & break". A professional dance instructor at the Thompson Lane Entertainment Center, her role in the franchise materialized when she took her students to the auditions herself. Along with her fellow cast for the movie, she appeared at the Teen Choice Awards to accept an honorary award charting the film's instant success and at the American Music Awards of 2007 accepting the award for Favorite Album. Stroh also serves as co-host for the dance-along version of High School Musical 2.

She also has a recurring role in the Disney Channel Original Series, The Suite Life of Zack and Cody as Leslie, a girl who played on the same volleyball team as main characters of the show, London and Maddie.

Nico Tortorella (born July 30, 1988) is an American actor and model. He is best known for his role of Trevor Sheldon in the 2011 horror film Scream 4, and as Razor in the ABC TV series Make It or Break It.

Tortorella is a native of Wilmette, Illinois and graduate of New Trier High School. He starred as supermodel Cole Shepherd in The CW's short-lived drama The Beautiful Life. He also guest-starred in the first three episodes of the ABC Family drama Make It or Break It playing Razor. He reprised this role in January 2010. He has one brother named Rocco who is a filmmaker and photographer.

Tortorella has a small supporting role as Tobias in the 2010 Joel Schumacher movie Twelve.

In June 2010, he was cast in a lead role of Trevor for the slasher film Scream 4., which was released on April 15, 2011. He was set to star in the independent film The Lowenfish Party, but the film was cancelled.