Toxic Rat was a normal rat that was mutated by crossing it DNA with the Bio-Dimensional Bug. He was used to spread deadly toxic fumes around the city. He battled the rangers and lost an arm, but due to eating enough toxic waste he was able to grow it back, and used it fumes to blind Ako the blue swallow. later Ako haveing regained some other sight knocks Toxic rat unconcious, he grew in size but after a breif battle he is destroyed by the Tetra Buster.

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