Big 4 is a character in Yu-Gi-Oh! Reshef of Destruction. He is the game's incarnation of Nezbitt.
Big 4 is a member of the Big Bad Five and dresses as "Robotic Knight". He is the only member of the five, who dresses as a card that does not otherwise appear in the game.
Big 4 is not available for the player to Duel. However he and the rest of the Big Bad Five collectively Duel against Kaibaman and Summon "F.G.D."