The show was initially concieved as very formulaic and monster-of-the-week with no continuing plot lines. The major plot line that continued throughout the first 2 seasons was small mentions of the Source of all evil and how some of the demons and warlocks sent after the sisters were directed to. Season 3 dives further into that plot, with many episodes having small threads woven in. Season 4 finishes this story and begins another one that will ultimately wrap up by the 100th episode of season 5. The latter half of season five goes back to the monster-of-the-week ideas. The majority of season 6 follows one entire plot line intertwined into the monster stories. Season 7 had 3 different plots connected and season 8 wrapped up the story with the worst actress to ever have a recurring role in Christy Jenkins. Brad Kern had an obsession with putting the main actresses in the skimpiest costumes ever, culminating with the three girls writing a clause in their season 8 contract stating no costumes for them. He was able to write in Alyssa Milano riding a horse naked in homage to Lady Godiva in season 6. Shannen Doherty saw the direction of the show tanking with the departure of original series creator, Constance Burge, in season 3, and left between seasons—though at the time most media outlets reported it had to do with a tiff between her and Alyssa. While the show remained on the air through season 8, and while Shannens departure brought an arguably creative resurgence to season 4, the latter 4 seasons were nowhere near the quality of the first 4, and were heavily influenced by greco-Roman legends, while the first 4 borrowed legends from around the globe. Constance’s idea of sister-witches instead of witches that were sisters kept the show grounded the first 3 seasons, while after that there was a larger focus on the supernatural aspect of the family, which hurt the quality of the show.