Antiman
From Tardis Wiki, the free Doctor Who reference
The Antiman was a hybrid creature that came into being after Morestran Professor Sorenson was contaminated with antimatter. As contamination grew stronger, the braincells were destroyed and Sorenson descended into animal brutality.
After exposure to a power boost, the Antiman multiplied into duplicates of pure energy, each able to walk through bulkheads, as they went on their killing rampage.
