Snathe

Colonel Snathe was a commanding officer from the Imperial Sontaran Fleet before he was banished for some failure to the Betrothal of Sontar, a Sontaran mining ship, where he is forced to work with the pacifistic Commander Lerox whose kind he saw as mongrels. He begins searching for the Worldbane. The Worldbane was believed to be the most powerful superweapon ever created and was located on the icy world of Serac. Snathe had the Sigil of Thanatos tattooed onto his chest to remind him of his search.

The Tenth Doctor arrives with Rose Tyler and gets brought to him by Sontaran troops. Initially, Snathe almost beheads the Doctor with a cutlass but is persuaded to use him to find Thantos which he plans to wipe out pacifistic Sontarans and overthrow the leading members. But when Thantos starts to destroy Sontar due to declaring the Sontarans impure, Snathe snaps and threatens to slay Rose if the Doctor refused to stop it; only for Lerox to assault him to save her, thus proving Sontarans worth saving. Snathe flees, only to be poetically defeated by some of the Inuk he and his troops oppressed. (COMIC: The Betrothal of Sontar)

Personality
Snathe was an arrogant, ambitious soldier. He was bitter about being banished from the Imperial Sontaran Fleet, and also sees Sontarans with pacifistic genes such as Commander Lerox as mongrels to be slain.

Initially, Snathe is ready to kill the Doctor for glory, but is persuaded through his ego and desires to use him. He finds the Doctor's wisecracks and pacifism annoying.