Resurrection gauntlet

The Resurrection Gauntlet was a metal gauntlet (also known as The Glove and given the joking name of Risen Mitten by Ianto Jones), had the ability to bring the dead back to life for a limited time.

History
The gauntlet was recovered from Cardiff Bay by Torchwood 3 circa 1967. (TW: Everything Changes) It had a strange but unspecified connection to the "Life Knife", an alien artefact made of the same type of metal. (TW: They Keep Killing Suzie)


 * The Cardiff Rift would seem the most obvious explanation for the glove's presence in 20th century Cardiff.

The gauntlet could revive the dead, though only for a few minutes before their second, permanent death. Jack Harkness put Suzie Costello in charge of testing the glove. Costello became obsessed with the possibility of being able to bring people back to life, though only for minutes at a time. She began buying goldfish in bulk and killing them to test out the gauntlet. (Torchwood website) The Glove was more effective on recent, violent trauma victims. Suzie Costello began to murder residents of Cardiff with the Life Knife in order to improve her proficiency in using the glove (TW: Everything Changes). She conceived an elaborate plan to use the glove, the Life Knife and the gauntlet to bring herself back from the dead, permanently. (TW: They Keep on Killing Suzie)


 * Costello must have worked this out as a contingency plan, in case her murders got discovered, meaning that she had planned her suicide for some time.

Following the exposure of Costello as a murderer, she shot herself in the head, killing herself. The Glove was placed in Jack's safe and sealed with a "DO NOT USE" tag. Jack theorized that whoever had "lost" the glove wanted to lose it. (TW: Everything Changes)

Costello had already set into motion murders committed on her behalf so that Harkness would revive her, enabling her to come back to life, permanently. Gwen Cooper was the only Torchwood 3 team member at that time with the degree of empathy required to operate the glove without Suzie. When the glove was used on Suzie, Gwen's life force was slowly drained from her into Suzie and she even began developing the same wound as Suzie in the back of her head where Suzie's was. The only way to break this connection was to destroy the glove, which Toshiko Sato did, saving Gwen and killing Suzie again. However, Ianto Jones pointed out that "gloves come in pairs", implying that there may be another glove. (TW: They Keep on Killing Sizie)

After Cooper's love, Rhys Williams had died, she briefly asked whether they could use the glove to make him come back to life. (TW: End of Days)

Characeristics
Suzie's research showed that the glove was slightly radioactive and that the glove possesses "low psych levels" which allows it to directly respond to brain activity It was later established it has an empathic link in the form of energy with its wearer, which showed up on video cameras, like "a rope from [the] heart to the glove" and that transfers the life force of the wearer to keep the dead alive. (TW: They Keep on Killing Suzie)