Separated from its family, a small orange tabby cat must navigate a subterranean, neon-lit city populated by robots and decay, seeking a rumored "Upstairs" while accompanied by a lost drone drone companion, B12. Act I: The Fall
Following a holographic trail, the cat enters an old laboratory and finds a small drone, B12 , which becomes its companion. B12 is damaged, having lost its memory, but can translate the companions’ language and interact with technology.
The cat and B12 reach the Control Room at the very top. B12 overrides the system, opening the roof to the sky. However, the system's security locks in, causing B12 to drain its energy entirely, sacrificing itself to unlock the city.
The cat and B12 meet the "Outsiders," a small group of robots in the slums (Momo, Clementine, Zbaltazar, Doc) who dream of escaping to the surface. They need the cat’s agility to navigate dangers they cannot handle.