DC Super-Villains: Harley Quinn: Love makes a person do crazy things. And for the bubbly but psychotic ex-therapist Harley Quinn, that includes donning a bombshell costume, brandishing gag-themed weapons and murdering countless civilians—anything to create bloody mayhem for her berserk beloved, the Clown Price of Crime. The dangerously unpredictable and charismatic poster girl for chaos appears in selected episodes from “Justice League” and the award-winning “Batman: The Animated Series.”