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The Mutant Bat is a common Earth bat, which was mutated by Dr. Animo's Trans-modulator prior to Ben 10 vs. the Negative 10: Part 1.
Appearance

Before Mutation
Its body is very similar to a lizard's body but it has bat-like features. It has a wide mouth with a few small fangs. It has four small, red eyes. It has four big, bat-like ears and a horseshoe-like nose. Its neck and chest is covered by dark brown fur. Its body is grey and its legs and tail are light brown. It has claws on its wings and a spike on its tail.
Powers and Abilities
The mutant bat is very strong and can fly. It can hang up-side down, like normal bats.
It is resistant against Diamondhead's sharp crystals.
It can also create powerful sonic waves.
Appearances
Ben 10
- Ben 10 vs. the Negative 10: Part 1 (first appearance)
- Ben 10 vs. the Negative 10: Part 2
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