Pretty Little Liars Trailer: "Know Your Frenemies"

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There's only one thing more mysterious than A on Pretty Little Liars: the ABC Family previews for each upcoming episode.

Next week, for example, we know that an unexpected ally surfaces to help the girls out on "Know Your Frenemies." But the following video doesn't give us any idea who that will be.

Form your own theories as you read through our latest Pretty Little Liars review and see what you can surmise based on the official trailer here:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Pretty Little Liars Quotes

People who are meant to be together take a break and find their way back to their first love.

You think the truth is this big shiny disco ball of purity then go ahead and try it. See what it gets you. Telling the truth to the wrong person at the wrong time is how I ended up where I did. Take it from me you're always better off with a really good lie.

Alison