Reset

Reset was a drug that was being tested by the Pharm on volunteer trial subjects, who were not informed of its true nature.

History
Reset could cure virtually every known disease by "resetting" the human body back to its "factory setting". However, this was due to the fact that the drug contained the parasitic mayfly in its larval stage, and the larvae need a completely healthy host in which to gestate.

The mayflies cannibalised their larval siblings until only the strongest was left. The remaining mayfly then emerged from its host, killing him or her in the process. Should the host die prior to maturation, the surviving larvae had a short time in which they could leave the body and seek out a new host.

To conceal the truth about the drug, the Pharm hired a professional killer to assassinate the trial subjects before the mayflies could emerge. The Pharm hoped to perfect a safe form of the drug through experimentation and thus earn a Nobel Prize, but never got the chance as their operation was shut down by Torchwood 3. (TV: Reset)