text: Changes in the 1990s A new era began in 1990, with the introduction of Phil Mitchell (Steve McFadden) and Grant Mitchell (Ross Kemp)—the Mitchell brothers—successful characters who would go on to dominate the soap thereafter. As the new production team cleared the way for new characters and a new direction, all of the characters introduced under Gibbon were axed from the show at the start of the year. Ferguson introduced other characters and was responsible for storylines including HIV, Alzheimer's disease and murder. After a successful revamp of the soap, Ferguson decided to leave EastEnders in July 1991. Ferguson was succeeded by both Leonard Lewis and Helen Greaves, who initially shared the role as Executive Producer for EastEnders. Lewis and Greaves formulated a new regime for EastEnders, giving the writers of the serial more authority in storyline progression, with the script department providing "guidance rather than prescriptive episode storylines". By the end of 1992, Greaves had left, and Lewis became executive and series producer. He left EastEnders in 1994 after the BBC controllers demanded an extra episode a week, taking its weekly airtime from 60 to 90 minutes. Lewis felt that producing an hour of "reasonable quality drama" a week was the maximum that any broadcasting system could generate without loss of integrity. Having set up the transition to the new schedule, the first trio of episodes—dubbed The Vic siege—marked Lewis's departure from the programme. Barbara Emile then became the Executive Producer of EastEnders, remaining with EastEnders until early 1995. She was succeeded by Corinne Hollingworth.