Spencer Hastings discovered the identity of Board Shorts on 'Pretty Little Liars' last night (Jan. 28), but could that have ramifications for her for the remainder of the season?

Keep on reading to find out what we learned from the promo for episode 4x18, 'Hot for Teacher,' and the synopsis for 4x20, 'Free Fall.' Just beware of spoilers.

First up, the promo (see above), which is entirely focused on the fact that Spencer thinks Ezra is both A and Board Shorts. Based on the video, in episode 4x18 she will tell all the Liars her theory -- except Aria. You know, because no one wants to find out the love of their life has been stalking them in secret.

The next episode will even feature a confrontation between Ezra and Spencer, although that could be related to her recent addiction to prescription medication and not actually be about her discovery of his prior relationship with Ali.

As the synopsis for 4x20 reads:

Spencer is determined that it is finally time to tell Aria about what she has found out about Ezra, but Emily and Hanna are worried about what it could do to their friend. A wrench is thrown into the plan when Ezra tells Aria about his concern and suspicion of Spencer’s recent addiction problem. Now with Spencer’s credibility being questioned, can the girls trust what Spencer has been telling them about Ezra — could this all be a figment of Spencer’s tired brain or really just a clever ploy by Ezra to cover his tracks?

Basically, in order to discredit Spencer's claims about him, Ezra goes to Aria and mentions Spencer's recent problems with study aids, setting Spencer against her friends and making her claims look slightly insane.

Unfortunately -- as evidence suggests -- Aria will eventually find out the truth, which could effect her mental health.

Episode 4x18 of 'PLL' airs next week, Tuesday, Feb. 4, on ABC Family at 8PM ET.