Popcorn and Cactus are two cats. They are brother and sister, but are different in so many ways. Having recently moved house, they have not yet explored outdoors. One night, Popcorn decides to seek adventure outside. Cactus reluctantly follows, wanting to look after his sister. Popcorn is intrigued by the unknown surroundings, but soon finds herself in danger. The outside world also brings challenges to Cactus for different reasons. Separated from each other and feeling frightened, can they overcome their fears, find each other and make it home safely?