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arah and Cameron investigate a Japanese computer company, named Dakara, which may have a connection to the construction of Skynet. Meanwhile, Derek learns that Jesse is a spy sent back to investigate John, and that Riley is Jesse's partner in trying to come between John and his mother to keep them apart. Elsewhere, Ellison begins to realize that Catherine's supercomputer, code-named Babylon, is growing stronger and may be the threat that he is facing all along.

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