Prof. Thelonious Viper (Legacy of the Duelist)
|Japanese translated||Professor Cobra|
|Video game debut||Yu-Gi-Oh! Legacy of the Duelist|
|Viper, Prof. Thelonious|
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. This is a video game depiction of Thelonious Viper, a character from the Yu-Gi-Oh! GX anime.