At the
Australian Wildlife Park in
Sydney, zookeeper Chaz Hunt has a show that demonstrates scary and deadly animals. Maddie, an
inland taipan, appears regularly at the show but is feared by the public. Maddie is supported by Jackie, a motherly
saltwater crocodile, who tells her and her three best friends —Frank, a
funnel-web spider, Zoe, a
thorny devil, and Nigel, a
marbled scorpion— about the
Outback, a place recognizable with three mountains where creatures like them belong. One day, Jackie is removed from the zoo after she tries to save Chaz's son, Chazzie, from a moat; the staff and patrons thought she was trying to eat him. Saddened and in despair, Maddie decides to escape to the Outback with her companions to find a place where they can live happily. During their escape, Pretty Boy, a celebrity
koala, tries to alert the park's security but is paralyzed by Nigel. The group decides to take him with them, but not before he is caught on a security camera exhibiting mouth foam from his paralyzing. While crossing
Sydney Harbour, they run into Jacinta, a
great white shark, who is part of the Ugly Secret Society (USS) where animals considered "monsters" help each other upon hearing a password. When they reach
Circular Quay, Pretty Boy tries to get the attention of the city for rescue but finds that the world misbelieves he is dead from rabies after seeing the footage and his popularity has been taken by a
quokka named Giggles, convincing him to tag along with them on the journey. They get a ride from the outer suburbs on an excursion bus that takes them to the
Blue Mountains. Chaz and Chazzie catch up and have the bus pulled over to search the vehicle for the creatures, but an Aboriginal girl allows them to escape. Just after Pretty Boy goes on a tirade about how Maddie and the other creatures ruined his life, Chaz ambushes them and almost sedates Maddie, but Pretty Boy says the USS's password, which alerts some
Tasmanian devils to their presence. After the animals escape, Chaz ashamedly reveals to Chazzie that his adventurous and Australian wildlife expert history was all a lie and he only moved from
Florida to Australia after being inspired by television shows featuring Australian zookeepers. He decides to make it up to Chazzie by really going after the animals and bringing them back to the park, though Chazzie is no longer sure about the mission. Over the next few days, the animals are helped by many creatures of the USS on their way to the Outback, while Pretty Boy bonds more with the creatures. One night, Maddie sings a lullaby that she had sung at the park ago and was her only memory of her mother: she was washed out of the nest as an egg by a
flood and after a perilous journey, was found on the road by Chaz. Pretty Boy reveals that he was also orphaned, with his mother being killed by a moving car. The next day, Pretty Boy finds a tree of koalas and leaves the other creatures. Maddie and the others reach the three mountains. Not long after they arrive, Chaz rounds up and captures Frank, Zoe, and Nigel. Chazzie runs into Maddie and is initially scared of her, but warms up to her upon seeing that she is just as scared as he is of her. Chaz captures Maddie as well and places the creatures in boxes in the back of a truck, but Chazzie sets Maddie free without his father looking. Maddie who broke down crying over losing her friends tries to get the animals of the land to help her rescue them, but they initially refused due to the fact none of them had ever left before. However, Pretty Boy, having found life with the other koalas not as great as he thought, returns. He cheers her up and asks her to go to the rescue. Using a
fire truck, they catch up to the truck and break them out. When Maddie, Pretty Boy, and the other creatures save Chazzie from falling over the edge of a
canyon, Chaz fully sees these creatures as heroes and decides to let them return to the wild. At the three mountains, they reunite with Jackie, who is revealed to be the head of the USS and had escaped by knowing a few tricks to do so and then ordered the USS that she had founded during her lifetime to help the group on their journey, and they all join their new life in the Outback. ==Cast==