Visser One is actually Marco's mom. Marco first learned that his mom was Visser One in Animorphs #5- The Predator. Only Jake knew until Animorphs #15- The Escape. In number 15, all the Animorphs found out about Marco's mom. Visser One has appeared in Animorphs #5- The Predator and Animorphs #15- The Escape. She is also political enimies with Visser Three.
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