Robbie Flint was Agent Spark. Doctor Schwartzmann released him from prison for him to work as an agent as he was an explosive expert. He was sent to Cambridge to blow up a factory. He was a double agent, Agent Criss-Cross. (AUDIO: Criss-Cross) Retrieved from "https://tardis.fandom.com/wiki/Robbie_Flint?oldid=2666602" Categories: 20th century individuals Human spies Human criminals Human prisoners Safe crackers + cat Cancel Save Community content is available under CC-BY-SA unless otherwise noted.