Queen of Hearts

The Queen of Hearts was identified as Darren Wilden and also Melissa Hastings. Melissa confirmed that she was the second Queen of Hearts in Face Time.

Biography
The Queen of Hearts first appears in the Season 3 webisode "I'm A Free MAn." A different Queen of Hearts appears in the Halloween episode This Is A Dark Ride, during which he/she drugs Aria and tries to kill Spencer and Paige. In Season 4,  it is revealed there were two Queens of Hearts -  Darren Wilden and Melissa Hastings.

Season 3
Pretty Dirty Secrets

According to a caption from a photo by ABC family, the Queen of Hearts first appeared here, watching Noel and Garrett in the costume shop and wearing a different outfit.

This Is A Dark Ride



When Adam Lambert is walking away from Aria, viewers can see the Queen of Hearts in the background looking at them. He/she is seen holding the powder that Mona gave to an unknown individual earlier in the episode. When Aria isn't looking, the Queen of Hearts dumps the powder into Aria's drink.

Later, when Spencer goes back to look for Garrett, she has a dangerous encounter with the Queen of Hearts. He/She tries to throw Spencer off the train, but she manages to run away. The Queen of Hearts chases after her and starts to choke Spencer. Then Paige comes to the rescue by managing to pull the attacker off of Spencer. In the aftermath, Paige notices a red press-on fingernail hanging from Spencer's hair.

Spencer meets up with Hanna and they remark how large the nail is. Hanna says, "That's a big girl," and Spencer replies, "Or maybe it's not for a girl at all." This leads the audience to believe the person in the costume may have been male.

Mona-Mania

At the end of the episode, "A" buries the Queen of Hearts mask in the woods along with the Phantom of the Opera mask (which Mona wore while impersonating Caleb).

Hot Water

Paige tries to help the girls uncover the identity of the person in the Queen of Hearts costume. She contacts Shana, the girl who works in the Halloween shop, but Shana cannot reveal customer information. Unwilling to give up, Hanna stalls her while Emily looks at the costumer history on the store computer and sends it to her phone. She says she will enlist Caleb's help to figure out whose credit card was used to purchase the costume. This lead never pans out.

Season 4
'A' is for A-l-i-v-e

Mona tells the girls that she didn't try to push Aria off the train, but knows who did. She shows them a video of Wilden and a second Queen of Hearts, who Mona says is Melissa. However, before her face is shown the computer is hacked into and all the files are deleted.

Face Time
It is revealed Melissa was indeed the second Queen of Hearts.

Appearances
Season 3 (2) Season 4 (1)
 * This Is A Dark Ride
 * Mona-Mania (Mask)
 * Pretty Dirty Secrets
 * 'A' is for A-l-i-v-e (video)
 * Face Time (mentioned)