Cole officially joins the good fight when he goes undercover in an underworld brotherhood to help Prue, Phoebe, Piper and Leo learn more about the evil, but their trust in him falters when it looks as though they are being double-crossed.
original airdate--April 26,2001 rating--3.6 million
music: music--Charmed Theme song--"How Soon is Now" by Love Spit Love
Brotherhood of the Thorn is an elite gang that answer directly to the Source. The Source selects the members himself and they take a blood oath of a lifelong pledge of loyalty. They took over an investment banking firm to get a foot hole in the human world.
Goof: When Phoebe and Cole talk about him going undercover into the Brotherhood, Phoebe's grip on her pestle changes several times during the scene.
"When three sisters reunite they unlock powers that have been dormant since they were children. In fact, they are the Charmed Ones, the most powerful witches alive -- charged with protecting the innocent from evil."