The fourth season of Charmed, an American supernatural drama television series, began airing on October 4, 2001 on The WB. Airing on Thursdays at 9:00 pm, the season consisted of 22 episodes and concluded its airing on May 16, 2002. This season also saw the introduction of Rose McGowan as Paige Matthews—half-sister to Prue, Piper and Phoebe—and a slight alteration of the opening credits, due to the third season departure of Shannen Doherty as Prue. Paramount Home Entertainment released the complete fourth season in a six-disc boxed set on February 28, 2006.