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You may be looking for Jasko or another Sontaran named Jask.

Commander Jask was a Sontaran commander for the 130th Sontaran War Squadron Sniper Division,[source needed] who hunted Mickey Smith and Martha Jones. He was about to shoot the two from a platform, when the Tenth Doctor knocked him out by hitting his probic vent with a hammer. (TV: The End of Time)

Behind the scenes Edit

Jask was not named on screen or in the credits. However, his name was given in the script to The End of Time, Part 2, which is available for download on the website for The Writer's Tale.