From the Super Mario Wiki
“Mighty Plumber to the rescue! Faster than a speedy plunger! More powerful than a pipe wrench! Able to snag disgusting drain clogs with a flick of the wrist!”
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 TV Show. He saved a lady on TV from a water-clog monster when Cheatsy Koopa used a Magic Wand to teleport him to Castle Koopa. King Koopa then planned to trick Mighty Plumber into helping him steal Pipe Land's Coin Treasury, saying that the Mario Bros. were evil plumbers trying to steal it for themselves and he had to put it in Castle Koopa for "safekeeping". Mighty Plumber, who was eager to defeat them for "disgracing their profession", helped Koopa steal the treasure. However, Koopa revealed he was the thief all along. Disheartened by the trickery, Mario and Luigi rekindled his fire by showing him one of his signature tricks, the pipe battering ram (which was 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 retrieved the money with their combined forces. Finally, Cheatsy was forced to send Mighty Plumber back on TV, where he saved the lady from drowning in a leaky kitchen.
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