Gretta Grendelson was a biologist and one of the assistants of the research team sent to Sphinx by Urako University in 1522 PD.

When she first saw Jessica Pheriss's treecat companion, Valiant, she instantly wanted to pat him. She was rebuked by Jessica, but Valiant soon warmed up to her and tugged at her hair, much to her delight.

She was very interested in the treecats' prehensile tails and their gripping surface. (SK3)

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