With Livewire having teamed up with Harley and Ivy into committing crimes in Gotham, it's gonna be difficult for Batgirl to stop them. Luckily, she has help and that is Supergirl.
Butt Monkey: Poor Harley gets it the worst in this ep since it mostly deals with super-powered villains and she lacks the fighting prowess of Batgirl. With few exceptions, her actions are useless (hitting things with a big squeaky mallet) or worse (washing the insulating dust off Livewire with a seltzer bottle and shorting out her electrical powers), leading to eyerolling and mockery from the other villains.
I'm Melting: Ivy's hedge elephants, tiger, rhinoceroses and giraffes are destroyed this way when Batgirl deflects Livewire's electricity onto the hedge animals to save Supergirl and defeat Poison Ivy.
Only Six Faces: The episode's final scene displays the limited character designs in Timm Style animation. While out of costume and covering their hair in towels for a makeover, Supergirl and Batgirl look nearly identical.
Put on a Bus: Bruce Wayne is on a business trip in Europe. Crime in Metropolis is so low that Supergirl gets bored and heads out to help Gotham.