Gerri's Submersible

Gerri's Submersible was a small purple submersible that was drivin by Gerri Poveri, the main villain from The Magic School Bus episode, Ups and Downs.

Plot
Gerri's Submersible first appears when Gerri Poveri sees Ms. Frizzle and her class riding The Magic School Bus in the form of a submarine searching for the Monster of Walker Lake. Gerri then drives her submersible up to the Bus saying it looks like she's got "some competition". She then activates her submersible's claws and uses them to untie the ropes that were holding sand filled barrels Ms. Frizzle's students attached to the Bus to make it heavier so it will sink so they will break off so the Bus will get lighter again and float back to the surface, in determent to prevent Ms. Frizzle and her class from finding out Gerri was faking everything about the Monster.

Her Submersible then appears again when Gerri sees Ms. Frizzle and her class sinking back down the bottom again after they crumpled the Bus down to a small size, which gets her furious. Later on, after Wanda finds the Monster and discovers it's not real but instead an inflatable plesiosaur, Gerri drives her submersible up to her and explains everything about her fake Monster of Walker Lake Stories, when makes Wanda furious at her.

Later, after Ms. Frizzle and her class make the Bus lighter again by pumping the water out of the pontoons on the sides of the Bus to make it rise again, Gerri drives her submersible up to the Bus and she again activates it's claws and reaches them towards the Bus' pontoons and pops out the corks to re-flood them so the Bus would sink back to the bottom in deturmend to drown Ms. Frizzle and her class so she could get away with her Monster of Walker Lake Stories. She then evilly leaves Ms. Frizzle and her students in her submersible as it gets spotted on Tim's video camera as the Bus crashes back at the bottom of the lake again.

Back at the surface, Gerri's submersible is then seen hooked up to her helicopter as Gerri gets ready to do her next Monster of Walker Lake Story. As Gerri was doing her next story, her inflatable monster suddenly pops up out of the surface right underneath her submersible and her helicopter along with the Bus after Ms. Frizzle and her students got it to rise back up to the surface by pulling on each side of the Bus to uncrumple it, capsizing Gerri's helicopter in the process. What happend to Gerri's submersible after that is unknown.