Ep. 1: Return to Monster Rancher / The Time the Door Opens

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A year has passed since the final battle with Moo, but Genki still cannot forget his friends. Suddenly he is led by an image of Mocchi to a deserted shop with a Monster Rancher game disk. Playing the disk he sees his friends' quest to defeat Moo unfold before him and what happened in his absence. (Source: Wikipedia)