Batman and Harley Quinn

Briefly about the plot: Batman and Harley Quinn were United in the fight against evil! How it happened that suddenly became enemies work together? It turns out the thing due girlfriends Harley. Poison ivy along a human Fauna have decided to "pererodit" all of humanity and set thereby power of nature on Earth. Threatened the entire population of the Earth, because they produced mutogen was able to convert living organisms into plants. Still a bit and can't avoid catastrophe! Only enemies are United for a common cause, can stop the madmen.