Blackfire

The evil Sister of Starfire has been captured.
They think that treatment might help.

Dr. Thompson is more than happy to take her in...and 'help' her.

Precautions were taken, of course.

The gem that weakens her was embedded in her uniform and a shocking mechanism was built into her collar.

She walks in angrily.

"Would you prefer to be called Komand'r or Blackfire?"
"Blackfire, Queen of Tamaran and rightful Ruler of its Satellites."

A pause.

"I'll stick with Blackfire."

Dr. Thompson asks her about her background, how she came to Earth, got dethroned, eluded space authorities and later tried to forcibly reclaim the throne through nefarious means.

"Your hatred of your Sister..."
"Sister in your venacular- not mine!"
"What do you mean?"
"Your Earth term for Sister is females related by blood. We, like all Tamaraneans, were created through science.
We were given similar augmentations- though mine are better- and raised together. That is why you think of us as Sisters."
"Interesting."

She pulls out a glowing gem from a bag.
That is the counterpart to the one that weakens her...or so Blackfire thinks.

It is actually a very lifelike replica, but it will work for this.

"You clearly want this," she says, letting it swing back and forth.
Blackfire makes a move and gets shocked by a button press.
She watches the gem angrily and doesn't try it again (not yet- at least).

"All of this travel...and fighting...and chasing is making you tired. Very tired.
Blackfire feels it grow, but doesn't know why.