Strut was a professor and avid scientist. He was the brother of the Lorduke of Zazz. The two did not get along. He received a sample from the moon of Zazz and found a self-replicating robot within. He gave it to his brother as a bogus present. The robot proceeded to infect the planet as its numbers grew.
The Sixth Doctor confronted Strut and criticised the rocket he wanted to fly to the moon. The Doctor perfected a recall alarm, calling the robots to come into the rocket. Strut tried to enter the rocket to fly with them, but was unable to do so. It took off for the moon. Frobisher morphed into a hang glider to help Strut away from the blast. Strut was pleased the rocket had flown and made up with his brother. (COMIC: The Gift)