HydroWorld: Hydroplanetary Adventures - Season 1, Episode 45: "Sadie Albert and the Revenge of the Cabbage Creatures"

After winning a local cabbage competition, Nolan and Molly's friend Trini Mumford soon discover that there is more to her favorite role-model than she thinks.

On a cold Friday evening, her dad tells the scary legend of the Cabbage Creatures, giant green monsters that rise out of the Hydro City Stadium every second Saturday of summer at noon. This keeps her up at night, and it makes her very afraid knowing that the creatures might really exist.

With Saturday fast approaching, Trini meets up with her friends Nolan, Tasnia, August (Auggie), and Molly during a walk through the park the next day. She tells them all about the cabbage creatures and how they might really exist. Tasnia, August, and Molly are of course freaked out about this, but Nolan keeps his cool and laughs it off. There's no way such creatures exist, and what Trini's dad told his friend is just a tall-tale.

Later that day, Trini sends an email to Sadie Albert asking her if she thinks the cabbage creatures really do exist. Sadie responds with a "negative no", telling her that they only exist in stories and aren't real before reassuring her that everything will be fine. That makes Trini feel a lot better.

Then Saturday arrives. Nolan and his friends fly over to the Hydro City Stadium in his Hovercraft Airship and surveys the area for any unknown appearances, just to confirm that Trini's original theories about the Cabbage Creatures weren't right.

Unfortunately, once the stadium's digital clock strikes twelve noon, the giant cabbage creatures erupt out of the ground. Everyone flees from the Stadium as Nolan issues orders to his teammates for defense. They fire their Hydro-Weapons and attempt to protect the Stadium as much as they possibly can. That is, until Sadie Albert arrives in her new airship.

Sadie Albert fires her "cabbage cannon", a specialized high-tech device with the ability to spray fertilizer at the creatures. The creatures grow very weak very quickly, slowing their advance and disarming the situation. But once the cabbage cannon fires at the largest of the creatures, the entire herd shuts down. This shockingly reveals that the giant green creatures are really just giant green robots operated by the mischievous Rogue villains.

The Rogues are immediately arrested and transported to prison cells on the Helicarrier aboard flying police dropships. Trini thanks Sadie for saving the day with her cabbage gadgets, and realizes that sometimes legends, even crazy ones, can become reality.