Oh Charles, can't you let the Pretty Little Liars have just one happy high school memory?

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Apparently not.

'A' has kept the Liars in a constant state of fear for the last five seasons, and season 6's ninth episode will prove no different. Rosewood High will ban Hanna, Aria, Spence, and Emily from their senior prom thanks to the bright red targets on their backs, but the girls' moms will throw the teens their own soiree...

...and it will be ruined by Rosewood's resident troublemaker.

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"One to never miss a formal, Charles has other plans in store to make this a night they will never forget," ABC Family teased.

"Last Dance" will be the midseason's penultimate episode, coming just one week before the Liars piece together the final clues to take down 'A' in "Game Over, Charles." How bad will life get before the mystery comes to a close?

Find out when Pretty Little Liars airs Tuesdays at 8 p.m. ET on ABC Family. Watch the video below to see a preview for the July 21 episode, "O Brother, Where Art Thou?"