Dogon

The Dogon Sixth Eye was one of the eyes of a Dogon, known for its special powers. Using it, a person could look back at their life more clearly. When ingested, Eugene Jones retained a presence in the world after dying. He was able to influence the mind of Gwen Cooper and eventually became corporeal and seemed to float into an afterlife. (TW: Random Shoes)

History
The Sixth Eye was first found on Earth after the Dogon arrived around the Great Fire of London. (WEB: torchwood.org.uk)

In the 1980s, Mr Garret found a Dogon Sixth Eye while golfing. He later gave it to Eugene Jones as a consolation prize for a science competition. (TW: Random Shoes)


 * Though unstated, it is likely that the eye came to Earth via the Rift.

After the Battle of Canary Wharf, Dogon Sixth Eyes appeared on eBay and became very popular in Belgium. (WEB: torchwood.org.uk)

In 2007, Eugene Jones decided to sell his Dogon eye on eBay. His friends Gary and Josh planned to buy the eye and resell it at a greater price. When they tried to take the eye by force, Eugene swallowed it and ran away. Though he was later killed, the eye brought him back as a ghost-like being, allowing him to help Gwen Cooper investigate his death. (TW: Random Shoes)

The collector Henry Parker also had a Dogon eye. (TW: A Day in the Death)