Jenna Marshall (Tammin Sursok) is the younger stepsister of Toby, Jenna lost her sight due to a prank played by Alison, intended for Toby. The girls suspect Jenna to be the mysterious "A." During season 1 she was revealed to have a sexual relationship with Toby prior to losing her sight. Toby is her stepbrother. Jenna's vindictive nature doesn't end with the girls, but also Toby as well, for trying to inadvertantly assist them.

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