"Gets Eaten" is the fourth episode of season one of the animated children's series The Magic School Bus. It originally aired on October 1st, 1994.
Arnold and Keesha were supposed to do a "Two-Things-That-Go-Together-Report," but they both completely forgot about it. Keesha only brings a tuna fish sandwich, and all Arnold brings is "scum" he got on his shoe when he stepped in a pond on his way to school. The two don't have anything in common...or do they? Ms. Frizzle takes the class on their beach trip, but once there, it quickly becomes a field trip when she shrinks the bus to explore the ocean food chain.
At the end of the episode, when everybody is laughing, Ms. Frizzle is wearing a green dress. When the camera zooms out, she's wearing a purple one.