The New York City sewers are vast, and home to more than just the Teenage Mutant Ninja Turtles! Mondo Gecko and Metalhead have a lair of their own, where they can live and enjoy all the video games their hearts desire. It's a good time—until Metalhead glitches out, trying to save the world from an enemy that only he can see. It's a situation too big for Mondo to handle alone, so it's a good thing he knows how to get ahold of the Turtles! It's a Mondo Metal time in Saturday Morning Adventures!