We know what Spencer will be up to on Pretty Little Liars Season 4 Episode 18:

Following her Board Shorts revelation on Pretty Little Liars Season 4 Episode 17, this student will be out to prove her theory about Ezra is correct... while popping some more pills in th process.

But what about Hanna? And/or Emily, especially when it comes to Alison and Shana? Where will "Hot for Teacher" find these characters?

View two clips from the installment now:

Pretty Little Liars Clip - "Hot for Teacher"

Watch Pretty Little Liars online if you need to catch up and then toggle through photos from this episode here:

Pretty Little Liars Photos from "Hot for Teacher"

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