Chimpanzee scientist who repairs Taylor's ship.
They cooperate as fellow chimpanzee scientists during the escape from the destroyed future Earth.
Cornelius and Dr. Milo salvage and repair Taylor's spaceship together before escaping Earth's destruction.
Their conflict is indirect because Milo dies before Hasslein's main investigation.
Hasslein's investigation concerns the future ape civilization made possible by the spaceship repaired by Dr. Milo.
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