Time warden

Time wardens were a group of time travelling police who operated in the Time Vortex. Their known responsibilities included arbitrating disputes over rights of way in time traffic accidents. Their technology allowed them to travel without space-time vessels. Their movement was accompanied by a ball of light and a loud popping sound during dematerialisation. They could guide time-travellers from the Vortex to nearby planets.

The Seventh Doctor and time wardens were mutually aware of each other.

A time warden arrived to mediate between the Seventh Doctor and Death's Head after a collision, but chose not to intervene when he saw how large and dangerous Death's Head was. He reappeared after Death's Head shrank down to a smaller size but dematerialised again when Death's Head promised to kill him if he interfered. He returned when he noted the sound of the TARDIS taking off without moving from its place. Finding that the Doctor had not fairly honoured his business contract with the bounty hunter, he said that he should arrest the Doctor but would overlook it this time. (COMIC: The Crossroads of Time)

Behind the scenes

 * The Appendix to the Handbook of the Marvel Universe notes the close superficial resemblance to the Time Guardian who appeared in, which was published five years after the Doctor Who character's appearance. The Time Guardian directs all time travel to and from his realm from the chamber called "the Crossroads of Time", coincidentally the title of the Doctor Who Magazine comic.