It is unclear whether Karmang has any of the powers of Martian Manhunter, it is not known details about his race, which although white seems to have no connection with the white Martians.
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Karmang lived on Mars, and is the sole survivor of a Martian civilization of more than a million years ago, even more ancient than the civilization of J'Onn J'onnz (the Martian Manhunter).
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While Superman and Captain Marvel fight to the death, Supergirl and Mary Marvel discovered the enemies responsible for the mess, fly to Mars and face Karmang in his castle.