From the Super Mario Wiki, the Mario encyclopedia
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Lightplungers are space-age weapons that only ever appeared in The Super Mario Bros. Super Show! episode "Star Koopa". Despite their name, Lightplungers deviate from the appearance of standard toilet plungers greatly, though their hilts do somewhat resemble plungers.
When not in use, Lightplungers resemble little more than a metal handle. Upon activating a Lightplunger, a javelin-shaped energy beam will extend from the handle, which is capable of paralyzing anyone it touches.
In "Star Koopa", Mario, Luigi, Princess Toadstool and Toad resort to using Lightplungers to fight off the attacking Stormtroopas, who fight with Lightplungers of their own. As they duel, the Stormtroopas show to be unsuccessful in fighting with Lightplungers, and the entire pack is defeated after they are all shocked with their opponents' Lightplungers.
Darth Koopa then appears to avenge the defeat of his Stormtroopas, and is challenged into an intense Lightplunger duel by Mario. Although neither of them are ever hit with a Lightplunger, Mario manages to kick Darth Koopa against a wall, where he has him pinned down with his Lightplunger. However, before Mario can triumph, Darth Koopa freezes him, along with the rest of his friends, with his Freeze Gun.