She was promoted to series regular as of season 2.

While Gluck initially served as a guest star, he was promoted to series regular later on in the season.

Morse was promoted to series regular starting with season two of the show, which began in April 2011.

In season two, Caleb's character was promoted to series regular.

Brooks had, by that time, been promoted to series regular on both series.

Jonathan Togo joined the show and was promoted to series regular.

In March 2012, Parrish was promoted to series regular for the third season.

He has been promoted from guest star to series regular for the third season, which is Mike's senior year of high school.

DeFer has officially been promoted to series regular starting in season 5.

He is promoted to series regular for the tenth season.