Eu pesquisei um pouco no Google e encontrei a seguinte resposta postada pelo usuário sallievern no whatsthatbook. com :
Viagem a Terezor por Frank Asch
Matt and his parents are rescued from a flood by alien robots who have set up colonies of intelligent beings from various worlds on Planet S-15. Matt joins two other children, Sarah and Ryan, in an attempt to reprogram a robot to get them back to Earth. Sarah and Ryan are caught, but Matt escapes to another colony and lives with the alien Dar for a while. Cyber, the robot, returns for him; they rescue Sarah and Ryan and set out for Terezor, the original planet of the robots. There, Matt changes his body to that of a (now extinct) Terezor and reprograms the master computer.