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Professor Thelonious Viper is a major antagonist in season 3 of Yu-Gi-Oh! GX. He is a harsh professor who makes his students duel ruthlessly by having them use bio bands.


Viper is a hard teache who was willing to drain duel energy from several students just to see his son. While his son meant something, it was still harmful to use other students as pawns. He was also manipulative, as shown when he got Axel Brodie to work for him. In the end, his own ego lead to his assumed death.


Viper is first seen with Axel as they head to Duel Academy. After arriving there, he meets Shepard and introduces himself as a man of action, saying the students will duel every day. Vellian Crowler and Jean-Louis Bonaparte try to stop him, but Shepard says that he will help the students. After Jaden and Jesse duel, he watches as there duel energy goes to him in his lab, which is where Wheeler was trained.