Death's Head was originally the robotic body intended for the Mage named Lupex, whose own body was beginning to fail him. The body in question was stolen by his wife Pyra after Lupex had taken over her lover's body. She spirited the robot away and provided it with programming, hoping to one day take revenge on Lupex for his crime on her lover.
Death's Head eventually surfaced as a bounty hunter, though calling himself a "Freelance Peace Keeping Agent", in one possible future for the robotic race known as The Transformers. His contracts there send him bouncing through time, and he encountered the time lord known as The Doctor. The Doctor played a pretty nasty trick on the Peace Keeping Agent when he shrunk him down to about human size, and bounced him through time yet again.
