Robbie Chang was a good friend of Maria Jackson. She had his number in the phone book of her mobile phone. Maria was a friend of Robbie in the "real" world as well as in Andrea Yates' alternative reality. (PROSE: Whatever Happened to Sarah Jane?) Retrieved from "https://tardis.fandom.com/wiki/Robbie_Chang?oldid=2229537" Categories: 21st century individuals Community content is available under CC-BY-SA unless otherwise noted.