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n 2027, Jesse's submarine mission takes a fatal turn that has unforeseen consequences for John, Sarah and Derek in the present when the 'box' is opened an a new and deadly, liquid metal T-1001 Terminator escapes and is loose aboard the sub. Back in the present, as Sarah prepares to move, she deals with Cameron who may become a liability to them, while John begins to doubt that Cameron was the one who murdered Riley, and he finally learns about Jesse's existence and struggles with a life-or-death situation of whether or not to kill Jesse. Elsehwere at Zeira Corp, John Henry becomes more humanly concerned that Catherine Weaver is up to something involving the 'termination' of her top employees, including Ellison.

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