Episode 1-"Charmed Again I"
Also Episode 2-"Charmed Again II"
The bewitching series begins its fourth season as a fresh face is added to the comely coven to replace the departed Shannen Doherty. Rose McGowan joins the cast as Paige Matthews, a half sister the Charmed Ones never knew they had. She meets the surviving Halliwells when she feels compelled to attend Prue's funeral. Phoebe seems to be coping, even after a premonition of Paige's death---at the hands of the same demon that slew Prue. Piper, however, is overwhelmed by the loss, and her crisis comes to a head when she nearly breaks down during the memorial service, as Cole faces off against two demonic bounty hunters sent to kill him.
Some of you still wonder why Prue died. The answer to this question is in this episode. Prue died because when Leo came back to Earth, he healed Piper first and Prue didn't make it because of that. (Remember: Shax hurt both Prue AND Piper. They were knocked out and dying.)

Episode 3-"Hell Hath No Fury"
Piper vents her anger over Prue's death by hunting demons, but her vanquishing spree put her, Phoebe and Cole in harm's way as she starts taking unnecessary risks. Paige, who is learning about her new telekinetic powers, steals the Book of Shadows from the mansion and attempts to photocopy the pages to use its spells for personal gain; a grieving Piper is vulnerable to the enticements of the Furies.

Episode 4-"Size Matters"
A hideous demon (Robert Englund) shrinks Phoebe down to five inches tall and uses her as bait for the other two sisters. (Sorry about the short detail but I couldn't find a better description of this episode. P. S. I think Robert Englund was Freddy Krugar in Nightmare on Elm Street.)

Episode 5-"Enter the Demon"
Paige makes a major blunder when carelessly mixing potions for Piper while secretly wishing she could be in Phoebe’s shoes training for combat, and ends up actually switching bodies with Phoebe. While the two sisters try to reverse the spell and struggle to harness each other’s powers, they must battle a Zen Master’s powerful disciple who has turned evil against his mentor and opened up a portal between two worlds.

Episode 6-"A Knight To Remember"
Paige’s favorite childhood fairy tale suddenly becomes real, bringing her face-to-face with a past life as an Evil Enchantress from Medieval times (also played by McGowan) and into the arms of a Knight in Shining Armor (guest star Charlie Weber). Phoebe (Alyssa Milano) and Piper (Holly Marie Combs) go back in time and end up trapped in the Dark Ages.

Episode 7-"Brain Drain"
Phoebe (Alyssa Milano) and Paige (Rose McGowan) must work quickly before Piper (Holly Marie Combs) is tricked into giving up all of their powers when The Source (guest star Ben Guillory) taps into her brain, altering her perception of reality and placing her in a mental institution. Julian McMahon and Brian Krause also star.

Episode 8-"Black As Cole"
In the midst of mulling over his marriage proposal, Phoebe (Alyssa Milano) comes face-to-face with Cole’s (Julian McMahon) demonic past when a widow tracks him down seeking vengeance for her husband’s murder. Meanwhile, Paige (Rose McGowan) encourages Piper (Holly Marie Combs) and Leo (Brian Krause) to test their readiness to become parents.

I can't wait till we get to see this episode!!! It sounds so interesting! =)

Episode 9-"Muse To My Ears"
A muse seeks help after a warlock begins capturing the other muses with a magical ring as part of his plot to inspire demons to assist him in overthrowing the Source. Meanwhile, Cole tries to compensate for the loss of his demonic powers by purchasing a gun for protection..

Episode 10-"A Paige To Remember"
Paige goes back in time to her high school days in an attempt to stop feeling responsible for the accident that killed her parents. Piper must prevent ghosts from the past, who have inhabited Phoebe's and Cole's bodies, from getting married or their souls will remain in Phoebe and Cole forever. Phoebe responds to Cole's marriage proposal.

Episode 11-"Trial By Magic"
Phoebe is summoned to perform jury duty and is assigned a murder case. Hit with a premonition about the real killer, Phoebe must convince the rest of the jury that the defendant is not guilty, and the only way to do this is to prove the existence of magic. (Aired January 24th)

Episode 12-"Lost And Bound"
Wanting to protect a ten year old orphaned boy who a firestarter, Piper and Leo go down to the underworld to kill a demon before he can deliver the kid to The Source. Phoebe is given Gram's wedding ring by Cole, but to their surprise the ring has been cursed to transform the wearer into a traditional 1950's suburban housewife.

Episode 13-"Charmed And Dangerous"
The Source breaks an age-old agreement between good and evil by stealing The Hollow, an ancient vapor which he uses to absorb first Piper's and then Paige's powers. Phoebe must allow Cole to help The Charmed Ones in spite of having had a premonition that involved Cole sacrificing his life to save her from evil. The sisters seemingly vanquish The Source, not realizing he has begun to take over Cole's body.

Episode 14-"The Three Faces Of Phoebe"
Phoebe develops a case of cold feet over marrying Cole and casts a spell which brings a young innocent Phoebe and an old cynical Phoebe to the Manor to help her make a decision. Cole now finds The Source is taking over his entire being. The Source's chief rival, who believes The Source is dead, is convinced by The Seer to kill The Charmed Ones in order to earn the allegiance of the entire underworld.

Episode 15-"Marry-Go-Round"
Phoebe is hoping that everything will be perfect for her and Cole’s wedding, but doesn’t know that The Source has completely taken over the groom and is sabotaging the ceremony in order to orchestrate a demonic wedding which will allow their foretold son to be heir to the underworld.

Episode 16-"The Fifth Halliwheel"
Paige is feeling out of place among the happy married people - Phoebe and Cole along with Piper and Leo, and the situation gets worse when Paige becomes convinced Cole’s still a demon, while he secretly plots to impregnate Phoebe with his evil spawn.

Episode 17-"Saving Private Leo"
Believing Leo left them to die when he was a medic in WWII, two ghosts from Leo's battalion try to exact revenge by killing those close to him. Distraught over the memory of being unable to save everybody in his unit, Leo loses his powers to protect The Charmed Ones. Wanting to separate a potentially pregnant Phoebe from her sisters, Cole makes Phoebe's life at the manor miserable so she will agree to move into an apartment with him.

Episode 18-"Bite Me"
Hoping to defeat The Source and gain re-entry into the underworld, demonic bats bite Paige. If she in turn bites an innocent, she will become a vampire forever. Cole tries to vanquish the Vampire Queen knowing that her death will kill all her vampires as well. Piper finally begins to suspect that Paige may have been right about Cole working with demons, but before she can say anything she learns that Phoebe is pregnant.

Episode 19-"We're Off to See the Wizards"
The three sisters discover that Cole is really the Source, and Phoebe joins him in the underworld to rule by his side, as his Queen. Also, Phoebe receives her new power, which was seen in "Pardon My Past."

Episode 20-"Long Live the Queen"
Piper succumbs to alcoholism, after it's revealed that Cole is the Source, and Phoebe has another power. Meanwhile, demons chase after a young man named Greg, who helps save young adults from going down the path of evil.

Episode 21-"Womb Raider"
The Seer enlists the help of a 7 foot, 2 inch demon nobody has figured out how to vanquish to help her magically take the baby from Phoebe and become The Source in the process. The baby inside Phoebe starts to take over her body turning her into an evil creature of instinct, nearly killing three people, including Paige. Piper and Paige must figure out ways to thwart The Seer's plans after The Seer casts a spell to place the unborn baby in her womb.

Episode 22-"Witch Way Now?"
The discovery that the sisters have fulfilled their destiny as 'the Charmed Ones', the Halliwells are given the opportunity to give up their powers and become mortal from the Angel of Destiny (guest star Dakin Matthews), in order to live a normal life. Phoebe and Piper are keen to take up the offer, but Paige isn't so sure it is a good idea.

Left-Right; Phoebe-Paige-Piper