The Magic School Bus Season 4 Episode 5 - Gets Swamped Episode Title:Gets Swamped.Episode Description:Walkerville is debating whether to build a mall where the swamp is now, or to build it somewhere else. With the flip of a coin, Ms. Frizzle's class finds themselves defending the swamp and Janet (from The Magic School Bus Gets Lost in Space, Butterfly And The Bog Beast, Gets A Bright Idea, and Works Out) arguing against them. However, the class finds out that the swamp is home to several organisms, but Janet finds this argument little more than a joke and the city agrees. That is until a tree gets knocked over by lightning, blocking off the swamp and flooding the city. After the crisis is resolved, the city realizes that if they were to build a mall on the swamp, it would be washed away.