In Terminator 3 : Rise of the Machines , Skynet sent T-X to a time before December 23 , 2003 .
Unable to locate John in the past , Skynet sends a new model of the Terminator called the T-X to July 23 , 2004 , to kill other members of the Human Resistance instead .
Terminator 3-COLON- Rise of the Machines