 After killing a boxer with a magic sword to steal his killer instinct, the warlock Gabriel uses the art collection of his sister Helena Statler to ambush Prue to kill her and get her power of the primogeniture witch. Prue uses a spell to increase her power, but she multiplies in three with two clones instead. The trio plus Phoebe and Piper plot a plan to defeat and destroy the invincible Gabriel, but when the clones are killed, the Halliwell sisters have to use the power of three.