His first appearance was in "All Hell Breaks Loose" when he was assigned to kill a doctor who was under the Charmed Ones' protection. He first attacked the Charmed Ones, Prue & Piper Halliwell whilst Phoebe was searching for a vanquishing spell for him in the Book of Shadows. He managed to fatally wound both sisters, but didn't manage to kill either of them due to Phoebe's timely appearance with the spell. Unfortunately, Phoebe said the spell alone and so only managed to wound him without the Power of Three. After being healed by Leo afterwards, Prue and Piper followed him outside and got attacked again, but Piper managed to blow him up. Unfortunately, the pseudo-vanquish was accidentally captured on film by a local news reporter who streamed the footage live onto television screens across San Francisco.
He appeared for a third time when the sisters went to collect the doctor again from the hospital. Once again they were forced to vanquish him outside, this time with the aid of the spell but whilst Piper and Prue were present Phoebe was in the Underworld with Cole. Although there were only two of the three Charmed Ones needed to chant the spell, Prue and Piper were able to defeat him.
As a result of exposing the existence of the supernatural, the Source (using the upper-level demon Tempus) was forced to rewind time to before Shax was wounded for the first time. Unaware of the change in the timeline, Shax returned and successfully carried out his hit when he fatally wounded both Prue and Piper after blasting them through a wall in their family home. Since Phoebe was stuck in the Underworld, where the timeline had not changed she didn't know when to go back to the overworld and was late to save both of them, allowing Leo to only heal one sister, his wife Piper.  Because of this Prue died and Shax became the only demon to ever permanently kill a Charmed One, thus shattering the sisters' Power of Three bond.
In Charmed Again, Part 1, Phoebe met Paige at Prue's funeral after the girl had been drawn there accidentally by Piper's casting of the To Call a Lost Witch spell, little did they know however, that she was their younger half sister. Phoebe had a premonition of Shax returning to finish Paige off on a rooftop in the same fashion he had with Prue. Luckily however, Phoebe and Cole managed to rescue her and wound Shax again after Phoebe had uttered the spell again.
His final appearance was almost immediately after the Charmed Ones had been reconstituted. He attempted to kill the girls in the attic but luckily they'd already led Paige to the Shax section in the Book of Shadows and instructed her to chant the incantation on it in sync with them. Hence, with the new Power of Three, Shax was vanquished once and for all, Prue's death had been avenged and Paige had experienced her first Spellcast/Vanquish/Demonic encounter.
Shax also appears in the Charmed novel, "Charmed Again" by Elizabeth Lenhard, which retells the events of Prue's murder, her subsequent burial and Shax's final vanquish by the three youngest Charmed Ones.
In an alternate reality, created by Cole, Piper is still hunting Shax (Centennial Charmed).
In the season 6 episode, Chris-Crossed, Shax briefly appeared in a scene from the future where a holographic rendering of his attack in Charmed Again, Part 1 is shown to the visitors of the Manor-Museum. The tour guide claims that the attack "scares them every time".
- ↑ Charmed, “All Hell Breaks Loose” Summary. TV.com. Retrieved on 2008-02-19.
- ↑ Charmed Series 4: Exit Prue, Enter Paige. Ciao (2006-01-20). Retrieved on 2008-02-19.
- ↑ Charmed "All Hell Breaks Loose", Prue: To Dr. Griffiths You're a healer, you do good. Now, either you have saved too many lives or you're about to save a life that [the Demons] don't want you to save.
- ↑ Charmed, “Charmed Again, Part I” Summary. TV.com. Retrieved on 2008-02-19.
- ↑ “Charmed Again”. Amazon. Retrieved on 2008-02-19.