The High School Musical film series consists of three Disney musical films directed by Kenny Ortega and created by Peter Barsocchini. It stars Zac Efron, Vanessa Hudgens, Ashley Tisdale, Lucas Grabeel, Corbin Bleu, and Monique Coleman. The original film was released simply as a Disney Channel Original Movie, but after its huge success it was followed by a television sequel. The third and final film received a theatrical release. Ashley Tisdale & Lucas Grabeel reprised their roles as Sharpay & Ryan Evans in a spin-off on the series titled Sharpay's Fabulous Adventure, it was a direct to video film.

High School Musical was released on January 20, 2006 as a Disney Channel Original Movie (DCOM), and is the most successful DCOM ever produced. The movie was Disney Channel's most watched movie in 2006, with 7.7 million viewers for its premiere broadcast in the US and 789,000 viewers for its UK premiere. It was the first DCOM ever to be broadcasted by BBC on December 29, 2006, and has been viewed by over 225 million people worldwide. The first film's leads were Zac Efron, Vanessa Hudgens, Ashley Tisdale and Lucas Grabeel, who sang most of the songs.

High School Musical is a 2006 American television film, first installment in the High School Musical trilogy. Upon its release on January 20, 2006, it became the most successful film that Disney Channel Original Movie (DCOM) ever produced, with a television sequel High School Musical 2 released in 2007 and the feature film High School Musical 3: Senior Year released to theaters in October 2008. It is the first Disney Channel Original Movie to have a theatrical sequel. The film's soundtrack was the best-selling album in the United States for 2006.

High School Musical was Disney Channel's most watched film that year with 7.7 million viewers in its premiere broadcast in the US, until August's premiere of The Cheetah Girls 2, which achieved 8.1 million viewers. In the UK, it received 789,000 viewers for its premiere (and 1.2 million viewers overall during the first week), making it the second most watched program for the Disney Channel (UK) of 2006. On December 29, 2006, it became the first Disney Channel Original Movie to be broadcast on the BBC. Globally, High School Musical has been seen by over 225 million viewers.

Ashley Michelle Tisdale (born July 2, 1985) is an American actress and singer who rose to prominence portraying the candy-counter girl Maddie Fitzpatrick in Disney Channel's The Suite Life of Zack & Cody and the female antagonist Sharpay Evans in the High School Musical film series. The High School Musical series became a successful franchise which included two television films, a feature movie, a spin-off and numerous soundtrack albums. The popularity earned by Tisdale in High School Musical led her to sign a solo record deal with Warner Bros. Records in 2006. Her debut album Headstrong, was released in February 2007, and debuted at number five in the U.S. chart and sold 64,000 copies in the first week. It was later certified Gold by the Recording Industry Association of America. A second studio album, Guilty Pleasure, was released in 2009.

Tisdale owns a production company and has worked as an executive producer in movies which included the ABC Family television film Picture This. Tisdale has a prominent voice role as Candace Flynn in Disney Channel's Phineas & Ferb, a cartoon which became television's most-watched animated series among kids and tweens and had been met with acclaim by critics. In 2009, she was cast in her first major broadcast role in The CW's television series Hellcats as Savannah Monroe, an intense and very religious cheerleader.

Zachary David Alexander "Zac" Efron (born October 18, 1987) is an American actor and singer. He began acting professionally in the early 2000s and became known with his lead roles in the Disney Channel Original Movie High School Musical, the WB series Summerland, and the 2007 film version of the Broadway musical Hairspray. Efron has since starred in the films 17 Again, Me and Orson Welles, Charlie St. Cloud, New Year's Eve, and The Lucky One.

In 2007, Rolling Stone declared him the "poster boy for tweenyboppers" and featured him in their late August 2007 issue.

Efron was born in San Luis Obispo, California, and later moved to Arroyo Grande, California. His father, David Efron, is an electrical engineer at a power station, and his mother, Starla Baskett, is a former secretary who worked at the same power plant. Efron has a younger brother, Dylan, and had, as he has described it, a "normal childhood" in a middle class family. He is an agnostic, having never been religious. His surname, "Efron", means "lark" in Hebrew (his paternal grandfather was Jewish).

Vanessa Anne Hudgens (born December 14, 1988) is an American actress and singer.

Hudgens rose to prominence playing Gabriella Montez in the High School Musical series. Hudgens also has appeared in several television programs including Quintuplets, Still Standing, The Brothers García, Drake & Josh, and The Suite Life of Zack & Cody. In 2009, she earned critical acclaim for her role in the film Bandslam.

In addition to acting, Hudgens released her debut album V on September 26, 2006 which entered the Billboard 200 at number twenty four, and was later certified Gold. Her second album, Identified, was released on July 1, 2008 in the United States.

Hudgens was born in Salinas, California, and has lived with her parents throughout the West Coast from Oregon to Southern California. Her mother, Gina (née Guangco), held a succession of office jobs, and her father, Gregory Hudgens, was a firefighter. She has a younger sister, Stella Hudgens, who is also an actress. She was raised as a Roman Catholic. Hudgens is of mixed ethnic background, as her father is of Irish and Native American descent, and her mother, a native of Manila, Philippines, is of Chinese-Filipino-Spanish descent. All of her grandparents were musicians.