Please Don't Tell My Parents You Believe Her

Middle school supervillain Penny Akk has defeated every challenge thrown against her. She has bested heroes, villains, weirdos who can't make up their minds, robots, aliens, friends, rivals, enemies, natural disasters, secret admirers, and her own shyness.

Now she has only one opponent left.

Her own super power.

...and the other Penny who stole it.