Mario and Luigi disguise themselves as Riverboat Gamblers to rescue the Princess who is held captive on Captain Koopa's sidewheeler, "The Sinister Star".

The Marios finally find a way back to Brooklyn -- and are faced with a big decision when Koopa captures the Princess just at the moment they can return home.

Koopa threatens to turn the Marios into rocks unless Princess Toadstool agrees to marry him.

Our heroes travel to Oceanworld where they discover Captain Koopa-Nemo is using a super submarine to terrorize the Mushroom People.

The Marios discover the Mother Lode of Gold Coins, but -- Klaimjump Koopa rides in and takes over.

The Marios, the Princess, and Toad arrive in Sock Hop Land to save the music king Elvin Parsley from Greaser Koopa.

When Toad accidentally spills a shrinking potion on the Marios they must overcome the perils of giant Troopas, drain pipes filled with monster-sized bugs, and Koopa's big feet.