Karen opened the box to see a shiny latex version of Harleen Quinzel's costume when she started as a criminal. It caused her to remember the good time with Harley, even with the madness which had occurred. So Karen deiced, "Why not? I'll try it on. What's the worst that can happen?"
With Kryptonian speed, the change was quick and easy. She turned to look at the mirror, seeing how the costume perfectly fit her busty body. Thinking how hot she would be making the B-man get in his mansion...
The alien dressed as a clown blinked for a few minutes as she felt a little dizzy and confused. She tried to think. To remember... to remember she was Kare... Kare... Karleen Quinzel. Doctor Karleen Quinzel, having gotten her degrees in various sciences like physics and psychology due to her alien mind. And the fact she fucked her professers when she got board going to class when she knew all of this stuff.
'Dealing with all of that boring crap with Quintech caused me to want to cut loose, go crazy, have some fun. Which is when I decided to be bad and become the Karley Quinn! All the alien tech helps keep my identity secret, thanks papa Qin-El. If I hadn't turned to crime, I never met my true love, Mr. B. The B-man. Bats. Or Brucey in his daily life. God, I need to get Bats to ride his Karley. Cause I'm revved up. Either that or find Red.' thought the new supervillain as she wondered where to start.