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Jessi is Kyle's female counterpart, another Zzyzx project. Ballantine plans to use Emily and Jessi to infiltrate Kyle's life and destroy his support system so that eventually Madacorp, with Jessi's help, will be able to remove important information from Kyle's mind..

It is interesting to notice that she seems to develop her abilities faster than Kyle despite his training, this is probably due to the fact that she has spent a longer period in the tank than Kyle. (wikipedia.org)