Robots/WMG

Robots takes place in the same universe as Ratchet and Clank
In Ratchet & Clank it's always taken for granted that all the robots think and feel. Maybe at some point a group of robots decided to form a robot haven on an uninhabited planet. It would explain the lack of anything biological and I could totally see Ratchet and Clank crash landing in the middle of Robot City.