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Irongron used the robot to attack Hal the archer, who had tried to infiltrate his castle. However, the Third Doctor used a crossbow to shoot the control box from Irongron's hand. 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 to uphold the disguise. The Doctor won, but Irongron discovered it was him. (TV: The Time Warrior)