The Gruffalo

The Gruffalo was a book that Mo Northover tried to get his dyslexic son Elliot to read in 2020, on the day the Silurians attack their Welsh town of Cwmtaff. Elliot tried but soon gave up, insisting that he could listen to it by audiobook.

It contained the passage:
 * "But who is this creature with terrible claws,
 * Terrible teeth in his terrible jaws?"

(TV: The Hungry Earth)

When Sarah Jane Smith was reading an article from the Ealing Echo about an alien that the Shopkeeper claimed to have seen, Clyde jokingly compared its description to the book's titular monster. (TV: Lost in Time)