The Super Mario Bros. Super Show! (1989)

S1E44 The Trojan Koopa

King Koopa captures the Princess and locks her away in his seemingly impenetrable island fortress. To rescue her, the Mario brothers devise a clever plan by concealing themselves within a large wooden structure, dubbed the "Trojan Koopa." This clever ruse allows them to infiltrate the fortress, setting the stage for an adventurous showdown with King Koopa and his minions as they attempt to save the Princess and escape.