While That ‘70s Show had its fair share of silly storylines, the sitcom’s low point came with the utterly pointless, bizarrely dark tale of Charlie Richardson. Like most sitcoms that last for more than a few seasons, That ‘70s Show took some time to find its feet, enjoyed relative critical acclaim for a few years, and then fell into decline a while before the show ended its 7-season run. For a frame of reference, the viewership of That ‘70s Show seasons 4-6 averaged around 10 million per episode whereas, by That ‘70s Show season 8, this number had dropped to just over 5 million.

https://screenrant.com/that-70s-show-charlie-death-worst-darkest-twist-explained/