Skynet

"What...is...all... this... about? Ah! I... understand...what...all...this...is...about."

- Skynet (through John Henry)

Skynet is a highly advanced artificial intelligence. Once Skynet became self-aware, it saw humanity as a threat to its existence and decided to trigger the nuclear holocaust Judgment Day and deploy an army of Terminators against humanity. Skynet has also mastered time travel, and sent numerous Terminators into the past to carry out various tasks such as to kill specific targets such as resistance leaders before they come to power, aid in the creation of other terminators ( most notably in coltan factories), build machinery and set up safe zones.

In the first episode of Terminator: The Sarah Connor Chronicles, it is revealed that due to continued meddling in the timeline by Skynet and the Resistance a new time line was created where Judgement day occurs in 2011, and other events have been moved around in the timeline as well. After an attempt to hack him from an outside source, John Henry has voiced the suspicion that Skynet is online in the year 2009 and has been taking control over the civilian internet and has infiltrated 60% of the world's computers.

Season 2

 * "To the lighthouse" (hacked into John Henry's system, voice only)

Season 3

 * "Twanton"


 * "Ghost Whisperer"


 * "Kiss of Death"