Saurian (Extinction Event)

Professor Saurian was a dinosaur-kind creature from a planet similar to Earth whose planet faced an Ice Age that would see his kind destroyed. Having discovered Earth with its rising temperature, Saurian saw it as a potential new home world for his people. Using underground caves he set up a base from which to raise the Earth’s temperature even more by exploding all the planets volcanos. Saurian’s plan was stopped by the Doctor who managed to contain the explosion to one volcano. Not taking the Doctor’s offer of help, Saurian made his own escape in his spaceship before the volcano exploded. (DWAM: Extinction Event)

Saurian once again tried to change Earth history using a 'roll-back machine' that saw Times Square in New York being evacuated as the city was overrun by dinosaurs. Once again the Doctor defeated Saurian this time by resetting his machine "reversing the polarity of the neutron flow". Saurian was taken along with his machine and the dinosaurs back to the Jurassic Age. (DWAM: Dinosaurs in New York!)