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{{Infobox/Yu-Gi-Oh!/CharacterRedirect|Viper|the card part|""Viper"" (card part)}} {{For| name = other versions of this character| image name = Professor_Cobra.jpgThelonious Viper (disambiguation)}} | image size = {{Infobox character | image caption = Professor Cobra.png | english name en_name = Professor Thelonious Viper | japanese name ja_name = プロフェッサー・コブラ | romaji name romaji_name = Purofessā Kobura | asian english name ja_trans_name = Professor Cobra | alternate name other_names = Professor Viper | anime debut anime_debut = {{episode|Yu-Gi-Oh! GX|105|ref}} | video game debut video_game_debut = ''[[Yu-Gi-Oh! GX Tag Force 2]]'' | appears anime appears_in_anime = ''[[Yu-Gi-Oh! GX]]'' | appears video games appears_in_nds = * ''[[Yu-Gi-Oh! World Championship 2008]]''| appears_in_psp =* ''[[Yu-Gi-Oh! GX Tag Force 2]]''* ''[[Yu-Gi-Oh! GX Tag Force 3]]'' | relatives = [[Pierce]] (Adopted adopted son, deceased) | previous affiliation school = [[West Academy]] | occupation = Professor | previous occupation previous_occupation = Mercenary | gender = maleMale | anime deck anime_deck = [[Venom]] | gx04deck gx04_deck =

| wc08deck wc08_deck = Parasite of Light | japanese voice ja_voice = {{voice actors|ja|Masaya Takatsuka}} | english voice en_voice = {{voice actors|en|Sean Schemmel}}

'''Professor Thelonious Viper''', known in Japan as '''Professor Cobra'''「プロフェッサー・コブラ」(プロフェッサー・コブラ ''Purofessā Kobura'')in Japanese, is a professor hailing from [[West Academy]] and the main antagonist for the first arc of season 3. He was a former military commander who after losing his adopted son Pierce, allied with Yubel to revive him using the Bio-Bands to drain energy from the academy's duelists. After failing to defeat Jaden Yuki, Yubel changes his memories and then leads him off a ledge causing him to fall to his death.

While performing military services in a war-that ravaged his country, Viper came upon an infant whom he believed saved his life by drawing his attention away from an area which was suddenly detonated. In the English dub, it is simply stated that the rest of the unit he was with was ambushed and captured while he left them. He adopted the child, [[Pierce]], and came to regard him as the "angel" in his otherwise torturous life. Years later, chasing after Duel Monsters cards given to him by Viper as a present that were swept up in the wind, Pierce was run over by an oncoming vehicle (the dubbed version of that This scene is was cutfrom the dub, here, he died of an illness).

Later on, Viper entered [[Duel Academy]] in the third year and in a desperate attempt to aid [[Yubel (character)|Yubel]] (who promised to raise his son from the dead), Professor Viper pitted students against one another in [[Survival Duel]]s. The only concern he had was that [[Adrian Gecko]] grew suspicious of him. Viper attempted to get rid of him by forcing him into Survival Duels and setting the [[Bio-Band]] drainage level to maximum in an attempt to kill him, knowing that Adrian would still Duel. However, Adrian forced Viper to lower the level when he got the entire Ra and Obelisk dorms to Duel at the same time. Adrian later manipulated Jaden and his friends to act as decoys while he infiltrated Viper's hideout for a card Viper had. When [[Jaden Yuki]] and his friends broke into Viper's hideout, Viper found that Yubel still needed more energy and faced off against Jaden in a Duel (in the English versiondub, part of the reason was that Yubel wanted to see Jaden suffer). When he lost, Yubel, manifesting in energy form as CobraViper's son, re-wrote Cobramodified Viper's memories of RickPierce's death, tricking deceiving him into believing that Rick Pierce never died. In a stupor, Cobra Viper followed his "son" to the edge of the platform, where he seemingly fell to his death. (In the US version: after Yubel grabs Viper's face, he simply disappeared, which heavily implies his death, though this is not specifically stated.)

After Jaden became [[The Supreme King]], his words alongside Professor [[Mr. Stein]]'s linger in his mind, specifically about his not treating Duels as anything more than a game. Viper is seen one more time prior to Jaden's final Duel with Yubel as Jaden remembers all the people Yubel has wronged.{{-|left}}==Deck==Viper plays a '''"[[Venom]]" Deck''', which allows for the distribution of "[[Venom Counter]]s" through his monsters such as "[[Venom Snake (anime)|Venom Snake]]" and "[[Venom Boa (anime)|Venom Boa]]" to an opponent's monsters as means of weakening and ultimately [[destroy]]ing them. Several of his monsters are based on the [[wikipedia:nāga|nāga]], a serpent-like race in [[wikipedia:Hindu mythology|Hindu]] and [[wikipedia:Buddhist mythology|Buddhist mythology]]. One of these creatures, Viper's [[signature card]] "[[Vennominaga the Deity of Poisonous Snakes (anime)|Vennominaga the Deity of Poisonous Snakes]]", is able to circulate poison in the opponent's body upon inflicting [[damage]], declaring an automatic victory for its owner within three turns. {{Decklist||effect monsters =* [[Serpentine Princess (anime)|Serpentine Princess]]<ref group=Notes name=prin>This card is [[sent]] to the [[Graveyard]] via the [[effect]] of "[[Snake Rain (anime)|Snake Rain]]" during [[Yu-Gi-Oh! GX - Episode 119|episode 119]].</ref>* [[Vennominaga the Deity of Poisonous Snakes (anime)|Vennominaga the Deity of Poisonous Snakes]]* [[Vennominon the King of Poisonous Snakes (anime)|Vennominon the King of Poisonous Snakes]]* [[Venom Boa (anime)|Venom Boa]] x3* [[Venom Snake (anime)|Venom Snake]] x3* [[Venom Serpent (anime)|Venom Serpent]] x3|spells =* [[Snake Rain (anime)|Snake Rain]] x2<ref group=Notes name=two>He [[discard]]s a second copy to [[activate]] the first during [[Yu-Gi-Oh! GX - Episode 119|episode 119]].</ref>* [[Venom Shot (anime)|Venom Shot]]* [[Venom Swamp (anime)|Venom Swamp]]|traps =* [[Damage = Reptile (anime)|Damage = Reptile]]* [[Rise of the Sacred Deity (anime)|Rise of the Sacred Deity]]* [[Snake Deity's Command (anime)|Snake Deity's Command]]* [[Snake Whistle (anime)|Snake Whistle]]}} ==Duels=={| class="wikitable card-list"|-! scope="col" | Opponent(s)! scope="col" | Episode(s)! scope="col" | Outcome|-| [[Jaden Yuki]] || [[Yu-Gi-Oh! GX - Episode 117|117]]-[[Yu-Gi-Oh! GX - Episode 119|119]] || Lose|}