Mario's pet prologue

Mario's Pet Prologue is a episode before the season 1 episode 1, this episode features Mario, Luigi, Sonic, Amy, Silver, Shadow who discovering Brian the Scorchio.

History
Mario is sleeping until a young dragon is crying too loud, and Mario decides to adopts it and take care of a young dragon named Brian. Brian who eating candies grows rapidly is happy to be adopted by Mario, near the end of the prologue, Brian receives a message from Bowser and must rescue Peach who was been kidnapped.