In Teeth of the T. rex, robot T. rexes were also used to guard St. Bonecracker's prison and helped Fangetta, the jail's governor, to keep Teggs and Gipsy prisoner. A few models have also been used by the DSS to test weapons and train astrosaur cadets by replicating combat situations. They also appear in The Twist of Time, Destination: Danger and Deadly Drama! The robot T. rex used by Commander Gruff in Destination: Danger! seems to be a more realistic model, as it doesn't have laser eyes and was mistaken for a real T. rex at first.