|Character of Hey Arnold!|
|Family||Grandson Rex Smythe-Higgins III|
|Voiced by||Tony Jay|
Rex is Grandpa's arch-rival, ever since he won the Tour de Pond 70 years ago when Grandpa's boat "mysteriously" got a number of holes in it; today, he owns the pond. He has a grandson that was also named after him, Rex Smythe-Higgins III.
- Rex strongly resembles British actor John Cleese.
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