The Third Doctor, Jo Grant and were brought before the emperor. The Doctor explained how Ogrons were attacking them under the guise of humans. An Ogron ship landed, and using their human disguises, they attacked his court. One Ogron was injured and left behind, but the others left with the Master. Without the hypnosound, the emperor realised their true enemy. He authorised his son and the Doctor to inform the humans of these events. (TV: Frontier in Space)