Senstarg

Senstarg was a Sontaran Scientific Officer, as part of Commander Stenck's invasion of Earth, due to the Grand Serpent allowing them access through the shield of Lupari ships surrounding the planet. Stenck's ship was stationed at the Dark Energy Camera facility in Chile, which Senstarg congratulated him for, calling it a "wise" strategic move, even though it was Grand Serpent's idea.

Claire and Professor Jericho were captured by the Sontarans, and Senstarg linked them to a quantum reader, to psychically evaluate all possible timewaves to pinpoint the coordinates for the final Flux event. Senstarg successfully found it, and Stenck launched their Flux Offensive; to bring the Daleks and the Cybermen to Earth, under a false peace treaty, and leave them to be consumed by the Flux, while the Sontaran fleet are protected behind the shield of Lupari ships. Claire escaped, but Jericho was trapped on the Sontaran ship, as Karvanista formed the Lupari shield; this time, behind the Sontarans, leaving all wide open for the Flux. Senstarg entered and prepared to shoot Jericho, but the Flux destroyed the entire ship, killing them both. (TV: The Vanquishers)