Stike

Group Marshal Stike fought in the Ninth Sontaran Battle Fleet on the Madillon Cluster. He joined his subordinate Major Varl in Seville where together, they worked with Dastari towards putting together a laboratory where Dastari could work towards perfecting the Kartz-Reimer module, a crude prototype space-time vessel to assist (as ever) in defeating the Rutans in the endless Sontaran-Rutan War. To this end, the two Sontarans had captured the second incarnation of the Doctor and kept him in the cellar of a mansion. In particular, they wished to find about the Doctor's Rassilon Imprimatur and enable the Kartz-Reimer module to work.

The long-suffering Stike first got stabbed in the leg by Jamie McCrimmon, attacked by coronic acid, partly disintegrated by the time vessel, which the sixth incarnation of the Doctor had sabotaged, and finally blown up by his own spacecraft, which had been set to self-destruct. (DW: The Two Doctors)

He also looks like Group Marshall Nathan of the Tenth Sontaran Battle Brigade. (A Fix with Sontarans) This is because A Fix with Sontarans was made just after The Two Doctors so they did'nt have time to make new masks.