The Magic School Bus and Captain Planet Theory is a long-standing internet urban legend suggesting that Ms. Frizzle’s students were actually being trained to become the Planeteers. Fans point to the striking visual similarities between characters—such as Arnold turning into Wheeler or Phoebe becoming Linka—and the shared environmental education themes of both shows. The theory suggests that after years of field trips, Gaia (potentially a retired or evolved Ms. Frizzle) recruited the kids to protect the Earth from polluters. This meme is widely used to celebrate 90s nostalgia, explore wild fan theories, or joke about the evolution of characters across different animated universes.