The two children adopted by alien felines in Star Ka'at (1976) now find themselves on the Ka'ats' green-skied planet--of which black Elly Mae declares "I do believe this here must be some sorta dream! I never no ways 'spected we would come to such a fine, fine place as this!" But Jim, unhappy about their dependency on their Ka'at hosts and their difficulties in learning to mind-send, drags her off to the forbidden city once occupied by manlike Hsi and still somehow deadly to the Ka'ats. The robots who still maintain the deserted city (and whom Elly calls "them tin can people") don't touch Jim and Elly, but set out to kill the two Ka'at friends who have followed them there; however, the courageous children destroy the city's power source, making it safe for Tiro, Mer, and all future Ka'ats--and thus return to the Ka'at town as heroes. The silly story is impeded by long Ka'at summaries of past events and half-explanations of how their machinery works (nothing is ingenious by sci-fi standards)--and further bogged down by every sort of stereotype.