Back in 2003, Brie Larson was living in the fast lane, portraying real-life junior drag racer Courtney Enders in "Right on Track." Earlier this year, she received an Oscar for her portrayal of a young, captive mother in "Room."
Zac Efron became a teen heartthrob as a singing basketball player in "High School Musical." He reprised the role in two sequels and has since tackled indie dramas, like "The Paperboy," and has established himself as a comedy star.
Kristen Stewart rocketed to international stardom as Bella Swan in the "Twilight" saga, but her first role was an uncredited part as a girl in a water fountain line in "The Thirteenth Year."
Emmy Rossum was 13 when she appeared in "Genius." Since then, she's earned a Golden Globe nomination for her role in "The Phantom of the Opera" in 2014, and has starred in the Emmy-nominated drama "Shameless" since 2011, a part that has garnered her two Critics Choice Award nominations.
Taran Killam is no stranger to sketch comedy, having been on "The Amanda Show," MADtv," and now "Saturday Night Live." However, he can sing too, and is featured on the soundtrack for "Stuck in the Suburbs," a TV movie in which he played a pop star trying to change his image.
Before America Ferrera won a Golden Globe and an Emmy for her lead role in "Ugly Betty," she proved that "sí se puede" (yes we can) as she danced in "Gotta Kick It Up," a film based on a real middle school dance team.
Kaley Cuoco may be best-known for her roles in the sitcoms "8 Simple Rules" and "The Big Bang Theory," but before that she played a bowler in "Alley Cats Strike!"
Shia LaBeouf became a Disney staple as Louis Stevens on the comedy "Even Stevens." While on the show, he also starred in three Disney Channel original movies: "Hounded," "Tru Confessions," and "The Even Stevens Movie." He transitioned to blockbuster films with roles in the "Transformers" series and "Indiana Jones and the Kingdom of the Crystal Skull," but has been caught up in a number of controversies over the years.
Hayden Panettiere was 14 when played a military brat in "Tiger Cruise." The actress and singer has earned two Golden Globe nominations for her work on the musical drama "Nashville."
Though Raven-Symoné got her start on "The Cosby Show," she's known to many young adults as the star of Disney's "That's So Raven." The comedy wasn't her first time on Disney — she played Zenon's best friend in "Zenon: Girl of the 21st Century." She also starred in two of Disney's "The Cheetah Girls" films. She's been a co-host on "The View" since 2015.
Bryan Cranston already had an established career when he played an irresponsible man who steals from Santa Claus in Disney's "'Twas the Night." He earned his first Oscar nomination in 2016 for "Trumbo," and has won numerous awards for his portrayal of Walter White in "Breaking Bad."
Kat Dennings had to free her grandfather's spirit from an evil ghost in "The Scream Team." Since then, she's appeared in the "Thor" films and is currently on the CBS sitcom "2 Broke Girls."
Lindsay Lohan made her film debut in 1998 with Disney's "The Parent Trap" and continued working with the company for multiple films, including "Life-Size." She starred in the DCOM movie "Get a Clue," and her first non-Disney film was "Mean Girls" in 2004.
Demi Lovato's first major role was as the lead in "Camp Rock," a part she reprised in "Camp Rock 2," and which landed her a contract with Hollywood Records. The singer has since released five albums, embarked on world tours, and performed at the 2016 Grammy Awards. She is touring with her "Camp Rock" co-star and friend Nick Jonas this summer.
Finn Wittrock has earned an Emmy nomination for his work on "American Horror Story: Freak Show" and has starred in "Unbroken" and "The Big Short," but one of his earliest roles was in "Halloweentown High."
Before Mischa Barton dealt with teen drama in "The O.C," she played a young girl working to save dolphins — she could communicate with them telepathically! — in "A Ring of Endless Light."
Hilary Duff became Disney royalty as the star of "Lizzie McGuire," so it was only natural for the young actress to appear in a DCOM. Duff was forced to enroll in military school in "Cadet Kelly." She's currently on TV Land's "Younger."
Selena Gomez established herself as a Disney star with her lead role in "Wizards of Waverly Place." In 2009, she starred alongside Demi Lovato for "Princess Protection Program." She's continued to act but has also pursued a music career, and released her second album in 2015. She is currently on tour.
Comedian Tim Meadows popped over to the Disney Channel to play the villain, a mean TV producer, in "The Even Stevens Movie." A year later, he played the principal in "Mean Girls." He'll next appear in "Popstar: Never Stop Never Stopping," a comedic mockumentary starring The Lonely Island.
Debbie Reynolds earned her first Golden Globe nomination in 1950 for "Three Little Words," and emerged as a breakout star in 1952 when she starred in "Singin' in the Rain." She continued to have a prolific career, earning an Oscar nomination for 1964's "The Unsinkable Molly Brown." In 1998, she played Aggie Cromwell in "Halloweentown," a role she reprised for three additional films. She received the Jean Hersholt Humanitarian Award at the 2016 Academy Awards.
Mickey Rooney started his career as a child actor in silent films, and appeared in more than 300 films in an acting career that spanned 88 years. He was nominated for four Oscars. In 2000, he appeared in "Phantom of the Megaplex." He died in 2014 at the age of 93.
Though not counted as one of the Disney Channel Original Movies, "Northern Lights" was produced for Disney Channel, and it featured Diane Keaton as a woman who became her young nephew's guardian after her brother died.