The first series introduces the listener to Satan's world via its two newest arrivals - Professor Richard Whittingham and Thomas Quentin Crimp. In this series Satan is assisted by a demon called Gary.
With Gary gone, Satan now needs to look for a new assistant. A grovelling demon called Scumspawn seems very keen to get the job, but Satan has other ideas.
Series three sees Satan continuing in his quest to convince the Professor that all humans are deeply flawed.
The Professor tries to make Thomas a better person in series four.
The two Christmas specials broadcast at the end of 2002 concern themselves with Hell's newest arrival; a Salvation Army worker called Hope.
Overcrowding becomes a problem in series five. With God not wanting to do anything about it, Satan must try and make the world a better place so that less people end up in hell.
In series six The Professor has gone. Satan however soon has a new hobby, thanks to the arrival of a murdered historian called Edith Barrington. In return for writing a biography about him, Satan agrees to help discover who murdered her.
God has decided to go on a gap year and Hell receives a very inexplicable guest in this new series for 2009.
Two festive specials. Satan tries to ban Christmas, and decides he needs a holiday.
In 2012, the series was revived for another two-part special to mark the Olympics.