Time warden

Time wardens were a group of time travelling police who operated in the Time Vortex. Their known responsibilities included arbitrating in disputes over matter of way in traffic accidents.

One such individual appeared to mediate between the Doctor and Death's Head, but chose not to intervene when he saw how large Death's Head was. (DWM: The Crossroads of Time)

Behind the scenes
The Appendix to the Handbook of the Marvel Universe notes the close resemblance to the Time Guardian who appeared in Motormouth Issue 9.