The New York City Police robot sent Outside to summon protagonist Elijah Baley back to Headquarters during his time off, Geronimo is only recently activated to much fanfare. He is more humaniform than most robots on Earth. He has a resilient, dull-gray finish and changeless, rather idiotic face, nowhere near as human-like as Baley's partner, R. Daneel Olivaw. Baley addresses him as "boy" and refers to him as "it."