‘Pretty Little Liars’ Spoilers: Fan-Favorite Character Returns in Season-Ending Twist

"Pretty Little Liars" season five finale, "Welcome to the Dollhouse," was a jaw-dropper!

The season five ending's biggest twist was when the girls came across someone dressed like Allison (Sasha Pieterse) from head to toe. However, the person under the mask was the last person people would expect: it was Mona! Fans thought Mona (Janel Parrish), one of their favorite characters, met her gruesome death during the midseason finale.

Once again, Mona is trying to be one step ahead of "A." She pretends that she is brainwashed into thinking that she is Alison. After a very persuasive performance, Mona tells the girls that she was just playing the part.

Now that we know Mona is alive, who was the person that died? How will Mona's return affect the Hanna (Ashley Benson), Alison, Emily (Shay Mitchell), Spencer (Troian Bellisario) and Aria (Lucy Hale)? The girls were charged with Mona's death although their van never made it to the penitentiary in the episode.

The other big part of the night was the "A" revelation. Turns out an unknown character named Charles was "A" the whole time. The episode hints to the fact that Charles might be Jason DiLaurentis' twin brother. This plot twist might have been disappointing for some but I'm sure the story line surrounding "A's" character will get juicer.

The season ends with the Liars and Mona trapped inside the Dollhouse. Will they escape or will they be saved?

Here are some reactions from Twitter: