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The Probic vent was a part of all cloned Sontarans. At least partially artificial, it took the form of a small metallic tube attached to the back of the Sontaran's necks. This vent was normally used by the Sontarans as a way of directly feeding off energy to "recharge" rather than eating (as the latter was slower). The Vent was also a major weakness, since a blow to the Probic Vent could knock a Sontaran unconscious or even kill them. (DW: The Time Warrior) A lesser blow could cause them pain and/or stun them (DW: The Sontaran Stratagem). An arrow (DW: The Time Warrior) or a thrown knife (DW: The Invasion of Time) would almost certainly prove deadly.
The Sontarans did not find it a problem, however, since it meant that they must always face their enemy in battle and could not be cowardly and run away. (DW: The Time Warrior/The Sontaran Experiment). However, some people occasionally found ways to disable Sontarans from in front of them: for example, the Tenth Doctor momentairily disabled General Staal using a squash racket and a ball by rebounding the ball from Staal's Teleport pod and onto Staal's Probic Vent. (DW: The Sontaran Stratagem). Donna Noble uses a Hammer to hit a Sontaran on the probic vent when it had its back turned. (DW: The Poison Sky)
A List of weopons used to strike a probic vent
- A Metal pole. (DW: The Time Warrior)
- A Bow and Arrow. (DW: The Time Warrior)
- A Knife. (DW: The Invasion of Time)
- A Squash racket and ball. (DW: The Sontaran Stratagem)
- A Hammer. (DW: The Poison Sky)
- A High-heeled Shoe. (DW: The Last Sontaran)