Tuesday's episode of ABC Family's "Pretty Little Liars" is the highly anticipated summer finale episode, where viewers of the show will finally come face to face with Charles, or A, who is believed to be Jason and Alison's brother.

Alison found out who Charles is in the previous episode "Last Dance" when Charles removed his mask and revealed himself to his baby sister. And fans are expected to learn his true identity in the beginning of the summer finale entitled "Game Over, Charles."

According to actress Janel Parrish, who plays Mona, the final reveal is worth the wait, and she even called the midseason finale the show's "most exciting" episode ever.

"My jaw was on the floor," Parrish told E! News. "I found out who A was and I was shocked...then they give all the answers about why A did what A did and how A did what they did and my mind was like, 'Whoa, finally!' It was amazing."

A two minute video from the summer finale has already been released, and it shows Alison screaming at "A" saying, "Please don't do this!"

A is shown standing on the roof of a building contemplating suicide. As the police arrive, Alison screams, "I'll do whatever it takes to help you!"

"But just because we know who you are, it doesn't mean the game is over," Spencer adds.

While the cops get ready to take down A, Emily says, "Don't do this to your sister."

"You've spent your whole life trying to get back to your family. It's not too late," Aria says, in an attempt to stop him from jumping, and Hanna adds that they understand why he did what he did.

"You've been such a bitch to us, but we heard your story. We understand," Hanna said.
The summer finale episode will also answer questions like who killed Toby's mother, who hit Alison in the head with the rock and who killed Bethany. It will also reveal the identity of A's helpers.

"Pretty Little Liars" airs Tuesdays on ABC Family.

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