We first met Sara Harvey as the mysterious Black Widow at Wilden's funeral.
But we didn't find out the truth until season 6!
In season 4 Hanna found a webpage for Sara Harvey that was set up by her friends.
She'd gone missing around the same time that Alison did.
The Liars met with Sara's friends to find out how they coped with her disappearance.
Claire told Emily that Sara wasn't very nice and that she was secretly glad she'd gone missing.
A feeling that mirrored how the Liars sometimes felt about their own Queen Bee.
We then didn't hear much more about Sara until she was revealed to have been in the Dollhouse all along!
Emily bonded with Sara in hospital after they were rescued.
Pam let Sara stay with Emily while she figured things out with her mom.
She was anxious and jumpy after being a prisoner for years.
One time, the Liars were sent a video of a sleeping Sara being filmed by someone holding a knife.
Was she ever going to be safe?
Pam wanted all of the girls, Sara included, to speak to Dr. Sullivan.
But Sara didn't feel therapy was right for her.
Emily helped Sara begin to live a normal life again.
The two even got tattoos together!
Caleb gave Sara a job... even though she'd never heard of Kimye.
And Sara and Emily got even closer!
She even turned up at Emily's prom so they could share a dance.
But it turned out that Sara had been Charlotte's sidekick all along.
And Emily couldn't have been more furious!
An electrical accident, when Charlotte was unmasked as A, caused irreversible injuries to Sara's hands.
And the Liars felt they were to blame.
Sara returned to Rosewood when she attended Charlotte's funeral.
Mona told Sara to back off and leave the girls alone.
But she wouldn't listen!
When Sara was seen getting friendly with Jenna and Noel in season 7, we knew there was trouble ahead!
Tragically, Sara's loyalty was soon questioned.
And she was murdered!
But who did it?