Charmed: Which Prue Is It, Anyway? on AllMovie

In her latest premonition, Phoebe (Alyssa Milano) sees her own sister Prue (Shannen Doherty) being fatally stabbed...for the "crime" of being the first born. It soon appears that this horrifying image will come true: just as the Halliwell sisters' great-great-great-aunt was killed by a demon warrior (Alex McArthur), so too does the selfsame warrior intend to dispose of Prue in order to steal her magic. In a desperate effort to save her sister, Phoebe inadvertently creates a "Prue clone" -- and even she can't tell the two girls apart.