Kieran Frost

Kieran Frost was Head of Security for Torchwood One. While popular with others, Kieran remained quite secretive about his personal life.

In 2005, Kieran and his team tested newcomer Rachel Allan on her observational skills. Later that year, Rachel successfully set him up with his personal assistant, Dean. (AUDIO: New Girl)

Still mourning for the loss of his partner and refusing leave, Kieran was given the task of killing Yvonne Hartman by Rachel Allan, the new director of Torchwood. Not long after catching Hartman, he was knocked unconscious by Soren, allowing Hartman to flee. (AUDIO: Through the Ruins)

He was partially converted in a Cyberman when Ianto Jones found him. He gave Ianto Object One. (AUDIO: The Torchwood Archive)