Zankou

Personal Data
NAME: Zankou (whether or not this was his birth name is unknown)

AGE: Inapplicable.

HAIR: Brown.

EYES: Brown.

OCCUPATION: Former ruler of the Underworld.

DESIGNATION: Demon.

KNOWN POWERS: Flaming, hurling fireballs, shape shifting.

KNOWN RELATIVES: None.

Background
Centuries ago, the Source viewed Zankou as a powerful threat to his reign. For that, the Source imprisoned him, thus ending any ambitions Zankou may have had about ruling the Underworld.

The full details of Zankou's actions that caused the Source to imprison him have never been revealed.

Zankou returns
In 2004, worried about the growing threat of the Avatars, the Demons of the Underworld freed Zankou. In no time, he quickly rose to become leader of the Underworld, eliminating all Demons who opposed him.

Zankou thus because, for all intents and purpose, the new Source. However, he never formally adopted the title for himself.

A shotgun wedding
Despite his clear threat to them (and his vanquishing of Kira the Seer, who was under their protection at the time), the Charmed Ones were forced into an alliance with Zankou to combat the Avatars. The alliance was successful and the Avatars were forced to retreat. Zankou then took his leave of the sisters, however, he would soon return.

Zankou's first attempt at getting the Nexus
In 2005, Zankou made his first attempt to gain access to the spiritual Nexus, located beneath Halliwell Manor. He believed that this would give him ultimate power. The plan was thwarted when the Shadow, the being that lived in the Nexus, entered the only neutral party, the now human Leo Wyatt. Zankou was forced to retreat.

Second try
A few weeks later, Zankou made his second attempt. Through careful manipulation of their emotions, Zankou was able to weaken the Charmed Ones to a point where he could steal the Book Of Shadows. This allowed him free access to the Manor.

However, the Charmed Ones were finally able to recover the Book. There they discovered the spell that would destroy the Nexus (or the Shadow, it's unclear which). They waited until Zankou took the Shadow into himself, and then cast the spell, destroyed the Nexus and Zankou along with it. Zankou was finally vanquished.

In the Wasteland
Like all vanquished Demons, Zankou ended up in the Demonic Wasteland. There he would remain for more than a thousand years.

The 34th Century
In the 34th Century, Zankou finally escaped the Wasteland and returned to Earth. However, he found that in the millennium that he had been imprisoned, the Demonic Underworld had made peace with the side of good. This had been inspired by the actions of the Warlock Insurgency, that Rex Buckland and Hannah Webster had led, and the actions of the descendants of the Halliwell sisters and Charmed Sons. Zankou tried to stir up trouble in the 34th Century Underworld, but no one had wanted anything to do with him or his outdated ideals. Zankou found himself a relic of a bygone era.

Zankou attempts to change the past
Frustrated that his efforts in the 34th Century were getting nowhere, Zankou broke into one of the time research labs and stole a time displacer, which allowed him to travel back in time to 2013. Once there, he planned to change the future so that the Underworld would never make peace with the side of good. To that end, he kidnapped Henry Mitchell and Coop, the husbands of Paige Matthews and Phoebe Halliwell, as part of a plan to eliminate their descendants from history.

However, the Temporal Enforcers had discovered the attempt being made to change time and dispatched Jenkalu Hannah Buckland back to 2013 to help in stopping it.

When she arrived in 2013, Kalu teamed up with her ancestors, Rex Buckland and Hannah Webster. With the help of Wyatt and Chris Halliwell, who themselves had traveled back in time from the year 2033, the group managed to track Zankou down in a cave in the Sierra Nevada Mountain Range. There, Zankou revealed his plan to the group, and then tried to kill them. However, with their combined powers, the group quickly defeated him.

Kalu then returned to the 34th Century, taking the defeated Zankou with her, where he will stand trial for his attempt to change the past.