Morok messenger
From Tardis Wiki, the free Doctor Who reference
A Morok messenger was a Morok soldier stationed at the Space Museum on Xeros. He informed Governor Lobos that an alien spaceship had arrived on Xeros. (TV: "The Dimensions of Time")
Behind the scenes
Salvin Stewart later plays a Morok guard in the last two parts of the serial. It is unclear whether they are the same characters.