The narrator guides viewers through key plot points with expository voiceover. This includes detailing Mewtwo's creation by Dr. Fuji and Team Rocket, recounting its awakening and the subsequent laboratory destruction, and explaining Mewtwo's invitation to trainers for battle on New Island.

The narration also frames the story's conclusion, describing how Mewtwo erases the human participants' memories of New Island and rewinds time to just before their departure from Old Shore Wharf. Delivered in a tone consistent with earlier Pokémon media, this omniscient account provides context on the unfolding events without direct character interaction.

This expository voiceover fulfills the same role in both the original Japanese version and the English dub.