Good Luck Charlie is an American television sitcom, which premiered on April 4, 2010, on Disney Channel. The series was created by Phil Baker and Drew Vaupen, who wanted to create a program that would appeal to entire families, as opposed to only children. It focuses on a Denver family, the Duncans, as they try to adjust to the births of their fourth and fifth children, Charlotte "Charlie" Duncan (Mia Talerico) and Toby Duncan. In each episode, Teddy Duncan (Bridgit Mendler) creates a video diary containing advice for Charlie about their family and life as a teenager. Teddy tries to show Charlie what she might go through when she is older in the video diaries for future reference. Each video diary ends with Teddy (or someone else from the family, even Charlie) saying the eponymous phrase, "Good luck, Charlie".