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The Mozhtratta was a parasite who repeatedly encountered the Tenth Doctor and Heather.

Weakened, he hid away at the University of Edinburgh. Feeding on the residual vortex radiation, he planned his revenge and waited for Heather's return. When she reappeared he captured her using students under his control and, tied down to a ReCohesion Canon, he used the canon to drain the rest of the energy from her DNA. Unfortunately echoes of Heather's life, her memories, manifested themselves and led the Doctor to her aid. When the canon was turned against Mozhtratta, he "disappeared up his own atoms", trapping him in his own DNA. (COMIC: Dead-line)