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Plessie is a character that appears in SMG4: Stupid Mario 3D World. Her name may be based off of The Loch Ness monster, also known as Nessie, of Scottish folklore.
Plessie is an orange dinosaur that swims inside the ocean. She appeared in SMG4: Stupid Mario 3D World, when she was going to save Mario when he was drowning in the ocean part of this level when Mario, Luigi, Peach, & Toad were going to save the Green Sprixie from Bowser.