Scarlet Overkill

"Have any of you ever dreamed of working for the greatest super villain of all time?!"

- Scarlet Overkill introduces herself

"Don't you "Scarlet" me, you backstabbing little traitors!!"

- Scarlet angry of Kevin, Stuart and Bob's betrayal

"Are you really going to allow that little penguin to take off with MY CROWN?! Oh, Herb, I'm done... (Bob gives her his small crown) For me? Awww."

- Scarlet's last words

Scarlet Overkill is the main antagonist of the 2015 film  Minions, the prequel to the first Despicable Me.

She is voiced by Sandra Bullock, who also portrayed Margaret Tate.

Information
She is a stylish and ambitious villain determined to dominate the world and become the first female super-villain, she is also the wife of Herb Overkill.

Scarlet's introduction
Scarlet first appears Villain Con, where she chooses henchman for her by taking the red ruby from her, it turned out Bob did and replace it with his teddy bear Tim, so Scarlet choose Kevin, Stuart and Bob to go and live with them, she introduces them to her husband Herb Overkill who will give them gear to help Scarlet steal the crown jewels of england.

Back Stabbing Little Traitors
Next day Scarlet finds that Bob is now king and wants to kill them for their betrayal, she finds them and Bob changes to rules for Scarlet to be queen, then she tricks them into thinking their going to get their award but puts them in a dungeon for nearly snapping Scarlet leaving them with Herb (by his alias Blerb) to be tortured.

Queen Scarlet
So they manage to escape and try and stop Scarlet from being queen, by accidentally crushing her with a big object and gets into her Jetpack and send out a angry mob to kill Kevin, Stuart and Bob, but only Kevin manages to escape leaving Bob and Stuart to be exploded by dynamite that Scarlet put out, but Kevin gets in a giant form and manages to save them.

Final Battle
Scarlet doesn't give up yet and tries to kill the giant Kevin, with Stuart and Bob, when the minions arrive to save them from Scarlet, but she surrounds them with lava and shots a rocket at Kevin and then eats it, Scarlet tries to escape but Kevin grabs her and explodes in the air with Scarlet and Herb as well and somehow survived it.

New Master
Later somehow, they survived the explosion and escape with the crown, but gets frozen by young Gru's Freeze Ray and Kevin, Stuart and Bob find their new master. Bob gives his small crown that queen Elizabeth gave her and puts it in Scarlet's while frozen with Herb, it was unknown what happened to Scarlet at this point, but she and Herb may have survived and are presumably in jail for their actions, but not long after Bob kindly and willingly gave Scarlet Tim's crown that made Scarlet somewhat happy.

Trivia

 * Scarlet is similar to Stephanie Gaunt as both are villainous women and both try to use others to steal The Queen's crown jewels for them (for Scarlet it is Kevin, Stuart and Bob whilst with Stephanie it was Tom Clarke and Lexi).