Commander Kaagh is a Sontaran of the Tenth Sontaran Battle Fleet of which he escaped using an escape pod and he has a score to settle. He will oppose Sarah Jane Smith and her friends in The Last Sontaran and possibily Enemy of the Bane. He is also said to be a different kind of Sontaran to what has been seen before.
Kaagh seems to have battle scars. He is missing a chunk of his right ear, a scar running from his forehead to the right of his mouth, he is missing the gloves of his armour so his hands are revealed, and his armour is scratched and scuffed.
Commander Kaagh seems to have a new smaller version of the guns used in the battle between the Sontarans and UNIT (DW: The Sontaran Stratagem/ The Poison Sky) . He also has a new communicator.