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Thelonius Viper, known as Professor Cobra (プロフェッサー・コブラ, Purofessā Kobura) in the Japanese version, is an opponent in Yu-Gi-Oh! Legacy of the Duelist and Yu-Gi-Oh! Legacy of the Duelist: Link Evolution. This is a video game depiction of Thelonious Viper, a character from the Yu-Gi-Oh! GX anime.

=Decks

Venomous Reptiles

Challenge Deck

Invasion of the Worms
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