Robot Knight

The Robot Knight was a robot created by the Sontaran Jingo Linx. It was made from a knight's armour and given to Irongron as a gift. It was activated by voice control.

Irongron used the robot to attack an enemy archer that had tried to infiltrate his castle. However, the Third Doctor used a bow and arrow to shoot the control box. This caused the robot to go on a rampage.

Later, the Doctor masqueraded as a robot knight in order to gain access to the castle. Irongron requested the robot knight to fight him, so the Doctor was forced to take part in a sword battle with Irongron. The Doctor won, but Irongron discovered it was him. (TV: The Time Warrior)