While this incarnation spent most of his time exiled on Earth—grudgingly working as UNIT's scientific advisor—he was occasionally sent on covert missions by the Time Lords, where he would often act as a reluctant mediator. Even though he developed a fondness for Earthlings with whom he worked (such as Liz Shaw and Jo Grant), he jumped at any chance to return to the stars. Though he had a somewhat patrician and authoritarian air, he was quick to criticise authority, and often exclaimed "Now "listen" to me!" when dealing with people seeking to obstruct him.