Koopos

Koopos is an island that only appears in The Super Mario Bros. Super Show! episode "The Trojan Koopa". King Koopa kidnaps Princess Toadstool and holds her hostage on a fortress located on the island. The fortress is guarded by King Koopa and two Hammer Brothers. Mario, Luigi, and Toad ride their bathtub across the ocean, arriving on the island. They build a large wooden Trojan Koopa statue and hide inside of it to sneak into the fortress and rescue Princess Toadstool. They escape using the Trojan Koopa as a raft, while King Koopa steals their bathtub and uses it to leave the island.