Description: During its first season the show featured thirteen starring actors, all credited in the opening sequence. For the show's second year, several actors, mainly child and teenage ones, who had guest starred during the first season, were promoted to series regulars without having their names included in the opening sequence. Instead they were billed... ( +expand to view full text )

Description: During its first season the show featured thirteen starring actors, all credited in the opening sequence. For the show's second year, several actors, mainly child and teenage ones, who had guest starred during the first season, were promoted to series regulars without having their names included in the opening sequence. Instead they were billed as "also starring" during the first minutes of each episode, together with episode guest stars. This practice continued for season three.