Lilo, a 5-year-old girl, has always dreamed of having a pet dog. Today, she finally got her wish. With the help of her sister, she adopted a stray puppy and named him Steve. In fact, Steve is not a stray dog. He is a dangerous person from outer space with six legs. He sneaked to the earth during exile. In order to conceal his identity, Steve has been hiding his other two legs. His appearance is the same as other puppies. In the daily life together, Steve and Lilo gradually established a deep relationship. However, at this time, the aliens who were chasing Steve discovered that Steve was hiding on the earth. In order to force him to surrender, they kidnapped Lilo. In order to save his good friend, Steve decided to try his best!