The Magic School Bus Season 3 Episode 6 - The Magic School Bus Shows and Tells Episode Title:The Magic School Bus Shows and Tells.Episode Description:The class is on some kind of show and tell game show, one person shows and the other tells. Arnold will be bringing his rock collection and Dorothy Ann will be doing the "tell" part. However, Arnold arrives without his rock collection. He found a strange object, that he thinks would work much better, but nobody even knows what it is. Ms. Frizzle then takes the class on field trip to found out. She turns the bus into Suppose-O-Tron, that can test their hypothesis.