Extinct giant reptiles from Earth's prehistoric times, many were brought to contemporary London with the aid of a Time Scoop device created by Professor Whitaker, and of those behind the operation: Golden Age. Dinosaurs were also kept in hibernation by the Silurians, who used a dinosaur to guard their caves. A dinosaur was also part of a collection in Vorg's Miniscope. The Rani had an embryonic Tyrannosaurus Rex, which was caught in time spillage and suddenly grew to threaten her and the Master in the Rani's Tardis.