Yu-Gi-Oh! is the title of the first anime series based on the "Yu-Gi-Oh!" manga. It is not connected in any way to the "Yu-Gi-Oh! Duel Monsters" series (known internationally as simply Yu-Gi-Oh!). They are 2 different anime series that are based on the same manga series. Fans of Yu-Gi-Oh! use the fan name "Yu-Gi-Oh! A Shadow Game" when talking about this show. They may use "Yu-Gi-Oh! first season" or "zero season" to refer to this show but this is not correct.