A magic doodad is a small, yet powerful piece of jewelry, two of which are owned by the Mouth of the River.
In The Super Mario Bros. Super Show! episode "Rolling Down the River" the Mouth of the River, wanting to aid Mario and Luigi in their quest to rescue Toad and Princess Toadstool, gives them her two magic doodads. Once Mario and Luigi wear these magic doodads around their necks, they are transformed into Super Mario and Super Luigi.
Unfortunately, Mario and Luigi, after beating Captain Koopa, lose their magic doodads and their superpowers when the magic doodads are swiped from around their neck by Captain Koopa; it is unknown what happened to the magic doodads afterwards.
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