Wally Featherby loves animals. He has several pets, including a frog, a
tarantula, a hedgehog named Mimi, and a parrot named Golly. But one day
while teaching Golly to say Mimi's name, something strange happens. His
family starts claiming to see Mimi all over the house, even though she's
still in his room. Wally's friend, Axado, even calls to say Mimi is in
her yard. When the friends investigate the mystery, they discover
hundreds of hedgehogs overrunning the city! What's going on? What's
causing the multiplying Mimis? And how will Wally and Axado stop the
hedgehog horde?