The Twist of Time is the seventeenth book in the Astrosaurs series. The cover features Arx changing into Baby Arx. While testing some new super-armour for the DSS, Teggs and his crew are attacked by a group of allosaurus, who lead them to a mysterious planet at the edge of Dinosaur Space. The astrosaurs encounter a fierce monster which lives on the planet, which douses Arx with some special liquid that causes him to grow younger and younger. Meanwhile, the allosaurus, led by the vicious Vice-Marshal Frentos, are planning to use the time-water's unique properties as a weapon against the Vegetarian Sector...