The year is 2041; Julia, Johnny, Tabby, and Finn continue to help their extraterrestrial friend Ling save fantastical and vulnerable endlings. With the aid of their foster father Mr. Leopold and animal activist Dr. Abiona Maina, the group is getting closer to retrieving the remaining ‘last of its kind’ creatures and completing their mission. In the episode, a playful endling takes control of the farmhouse, locking Julia, Johnny, and Finn inside. It's up to Tabby to use her technical and scientific know how to save them from afar but figuring out how to stop this temperamental being means learning how to win its game.