Chuck Thorndyke is Chris's eccentric, brilliant, and kind-hearted grandfather. A gifted inventor and scientist, Chuck is constantly tinkering with gadgets and machinery, often with explosive or hilariously unpredictable results. Despite his scientific genius, he possesses a childlike wonder and an adventurous spirit, always eager to explore new phenomena. He quickly accepts and bonds with the anthropomorphic characters, viewing their presence as a fascinating scientific opportunity rather than a threat. Chuck provides comic relief, technical support, and a steady, supportive presence for Chris, often acting as a co-conspirator in keeping the animals' presence a secret. He's an indispensable ally, combining intellect with a quirky, lovable personality.