Powell also oversaw the rise of more populist continuing drama series, however, encouraged by the ratings-chasing strategy of the then Controller of BBC1, his friend Michael Grade. It was during Powell's tenure that the BBC launched the twice-weekly soap opera "EastEnders" (1985–present) and the medical drama "Casualty" (1986–present), both of which remain linchpins of the BBC One schedule today and the highest-rated drama productions on BBC television. Indeed, "EastEnders" achieved phenomenal success in its early years, its Christmas Day 1986 episode earning a massive 30.15 million viewers, the highest British television audience of the 1980s.Aside from these continuing dramas, based in one major location and shot entirely on videotape and thus comparatively cheap to make, longer runs of drama series became rare, with short series of six or eight episodes becoming the norm.