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'''Rex Raptor''', known as '''Dinosaur Ryuzaki''', in the manga and Japanese [[Yu-Gi-Oh! (second series anime)|anime]], is a "[[Dinosaur]]" [[Duelist]]. Despite his introduction as a powerful Duelist, he becomes a source of humiliation along with his companion , [[Weevil Underwood]] , after suffering defeat to [[Joey Wheeler]], and begins considering Joey his rival for this reason. Though Rex is vengeful, arrogant, and tyrannical, he plays fairly.
"Dinosaur" is a nickname; "Ryuzaki" is his given name. In the English anime, he is named after the Tyrannosaurus Rex and the Velociraptor, 2 types of dinosaurs.
During the tournament, he was constantly berated by the fact Mai had more [[Star Chip|Star Chips]] than him. He challenged her to a Duel to get revenge but Mai, preferring to avoid him, was content to use the excuse that she had already "beaten" him once. However since Mai had previously lost to [[Joey Wheeler]] and considered it obnoxious to challenge him again, she agreed to duel Rex, if he defeated Joey for her.
During his Duel with Joey, Rex gambled "[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]" in the hopes of winning Joey's "[[Time Wizard]]". (In the anime, "[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]" was an incredibly rare card that Rex received as a prize for being a runner-up in the last tournament.) This infuriated Mai as it would mean, Rex's [[Main Deck|Deck]] would be even stronger if she had to face him. However, Joey won the Duel and claims claimed Rex's "Red-Eyes".
====Battle City====
