Quick recap
Cameron survives the blast, but her chip is damaged and for a while she tries to kill John. The hunt for Skynet goes on, now focused on Catherine Weaver, head of ZeiraCorp and secretly a liquid-metal T-1001. She buys the Turk and builds John Henry, an AI that gets Cromartie's body. From the future come Jesse Flores, who is involved with Derek, and Riley, who becomes John's girlfriend. Both come from a different future, and Jesse ends up killing Riley. Derek is killed by a T-888. In the finale, Weaver says she's fighting Skynet too. Cameron gives her chip to John Henry, who vanishes with it, and John travels to the future with Weaver. There, Derek, Kyle and Allison have no idea who he is.

