The T-799 Cyborg Prototype Series "Eve" is the precursor to the T-800 Terminator. It is developed by Skynet in 2016. The T-799 was a slower model than the T-800 and less intelligent. The T-799 was used from 2016 to 2019 and was then used mostly for guarding the Terminator factories.[citation needed] Eve's appearance and voice are based on Sergeant Helen Wolfe, a Resistance combatant killed by a Hunter-Killer on the Canadian west coast.