The Marshal was a high-ranking Sontaran to whom Field Major Styre reported on his assessment of human physical limitations (TV: The Sontaran Experiment) in 16087. (AUDIO: Wirrn Isle)
He seemed to be impatient at Styre's delays, which were holding up the invasion fleet. After Styre was killed, the Fourth Doctor contacted the Marshal and told him that, without Styre's report, they could not invade and that the details of their plan were discovered. (TV: The Sontaran Experiment)
