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In Terminator: The Sarah Connor Chronicles season 2, "Goodbye To All That", Skynet is after one Martin Bedell of the future Resistance. In this episode there was 3 Martin Bedells. A Terminator killed Martin Bedell in Los Angeles. Sara Connor and Cameron save the young Martin Bedell. In the cadet camp at the Presidio Alto military academy Martin Bedell was saved by John & Derek.

So why does Skynet want to kill Martin Bedell in the Camp? What has he done in the future to be a target of Skynet?

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From the Terminator Wiki which I recommend you check first for answers to your many other Terminator questions.

Martin Bedell was an influential member of the Resistance who directly helped John Connor with the creation of the Resistance after the initial breakout from Century Work Camp.

Pre-Judgment Day

A member of a family long known for their service to the United States, Bedell was a graduate of Presidio Alto Military Academy and attended West Point.Prior to his graduation from the military academy, Bedell was targeted for termination by a Series 888 sent back in time by Skynet. His death was prevented by John Connor and Derek Reese who revealed to him knowledge about Judgment Day, Skynet, and the Resistance

Post Judgment Day

Knowing the fate of the world, Bedell continued his training and became an influential member of the Resistance through his military training. During the war he helped with the creation of weapons and was directly involved in the rescue of members of the captured resistance bunker "Kansas". The prisoner transports were being escorted to Century Work Camp by an Ogre. In an effort to rescue the 40 captured Resistance members (including John Connor and a pinned down Kyle Reese), Bedell sacrificed his life. So far,he is the only person from the new timeline in episode 22 to know John Connor.

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