Selena Gomez: Gomez made her acting debut on "Barney & Friends" as Gianna, a young girl who befriends Barney. She appeared on the show from 2002 to 2004, and later went on to become a successful actress and singer.
Demi Lovato: Lovato also appeared on "Barney & Friends" as Angela, a friend of Barney's who is learning to overcome her shyness. She appeared on the show from 2002 to 2004, and later became a successful singer and actress.
Debby Ryan: Ryan played the role of Daisy on "Barney & Friends" from 2007 to 2008. She went on to star in several Disney Channel series, including "The Suite Life on Deck" and "Jessie."
Cody Linley: Linley portrayed the character of Todd on "Barney & Friends" from 1998 to 2000. He later appeared in several films and television shows, including "Cheaper by the Dozen 2" and "Hannah Montana."
Joshua Peck: Peck played the role of Michael on "Barney & Friends" from 1998 to 2000. He went on to become a successful actor, starring in the Nickelodeon series "Drake & Josh" and the film "The Wackness."
These are just a few examples of actors who began their careers on "Barney & Friends" and went on to achieve success in the entertainment industry.