From the Super Mario Wiki
Mighty Plumber is a TV star who is idolized by Mario and Luigi. He appears in the episode "Misadventure of Mighty Plumber" in The Adventures of Super Mario Bros. 3. He saves a lady on TV from a water-clog monster when Cheatsy Koopa uses a magic wand to teleport him to Castle Koopa. King Koopa then planned to trick Mighty Plumber into helping him steal the royal Coin Treasury of Pipe Land, saying that the Mario Bros. are evil plumbers trying to steal it for themselves and he has to put it in Castle Koopa for "safekeeping". Mighty Plumber, who is eager to defeat them for "disgracing their profession", helps Koopa steal the treasure. However, Koopa reveals he was the thief all along. Disheartened by the trickery, Mario and Luigi rekindle his fire by showing him one of his signature tricks, the pipe battering ram (which is sticking a pipe with one end shut into a water drain, building pressure and propelling it to a sealed exit with tremendous force). The Mario Bros. and Mighty Plumber then retrieve the money with their combined forces. Finally, Cheatsy is forced to send Mighty Plumber back on TV, where he saves the lady from drowning in a leaky kitchen.
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