Lamprey
From Tardis Wiki, the free Doctor Who reference
A Lamprey was a creature that lived in the Time Vortex. It looked like a large faceless green serpent with suckers and long rubbery tendrils. It fed off chronon energy, could travel to alternate timelines, and change shape to appear human. Monica Lamprey and Sir Bertrand Lamprey were full Lampreys. Bertrand's daughter Helen Lamprey was half-Lamprey and half-human. (PROSE: Spiral Scratch)
