1x21 - Sweet Valley High

When it is discovered that Peter has escaped from prison, Liz and Jess are put under protective custody. After two weeks with no danger, Jess is sick of being watched and manages to successfully escape. Unfortunately, she runs straight into Peter, who kidnaps her thinking she is Liz. When Peter realizes that it is the wrong twin he is dealing with, he sets up a deathtrap for her to get closer to Liz.