Sixth Drax
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The Sixth Drax was one of Inspector McCormick's "half a dozen best men".
As such, he was present when McCormick was called to arrest the third, fifth, ninth and twelfth incarnations of Drax. They later all ran away in McCormick's TARDIS. (AUDIO: The Trouble with Drax)
This incarnation was the one killed by the Quantum Assassin. (AUDIO: Here Lies Drax)