Serial (radio and television) usually ran from Monday through Friday at exactly the same time every day. A show called The Smith Family which ran only one night a week on WENR in Chicago during the early 1930s was credited as the "great-granddaddy of the soap operas" by radio historian Francis Chase, Jr. One of the other shows that helped pioneer the daytime soap opera/serial was "The Guiding Light", which debuted on NBC radio in 1937, and then switched to CBS Television in 1952. "The Guiding Light" final episode aired on September 18, 2009, having a total of 15,762 episodes air on CBS. Some
Soap opera September 2008 to July 2012. Other Sigma TV weekday shows include "Akti Oniron" (which ran from 1999 to 2001), "Vourate Geitonoi" (which ran from 2001 to 2005, and was the most successful weekdaily series, achieving ratings shares of up to 70% of all television households in the country), "Oi Takkoi" (which ran from 2002 to 2005), "S' Agapo" (which ran from 2001 to 2002), "Vasiliki" (which ran from 2005 to 2006), "Vendetta" (which ran from September 2005 to December 2006), "30 kai Kati" (which ran from 2006 to 2007) and "Mila Mou" (which ran from September 2007 to January 2009).