A strong, bodybuilding PE teacher at Walkerville Elementary who is Ms. Frizzle's toughest competition in a triathlon event. Voiced by Dan Marino. Gerri Poveri The main antagonist of "Ups and Downs." She is the host of the reality show In Your Face and has claimed to have taken a real picture of a lake monster. She tries to keep Ms. Frizzle and her class from finding the monster at the bottom of the lake because it was a fake. But eventually, her plan doesn't come to fruition, and she is exposed, which makes her show even more popular. She is voiced by Cindy Williams. The Baker The baker who runs the bakery where the class secretly made the special cake for Ms. Frizzle's birthday party in "Gets Ready, Set, Dough!" When the bus shrank and snuck into the bakery, he mistook it for a moth. He also appears in the opening title sequence where the bus flies out of a cake. Voiced by Dom DeLuise. Larry A logger who runs a dial-up sanitation service. In "Meets the Rot Squad", when Wanda found a rotting log in an empty lot, at first she hated it and called up Larry to remove it. But later she and the class found out that the log had life in it, and helped make soil by decomposing. Then when Larry suddenly arrived, Wanda convinced him not to destroy it in disguise as a "Log gremlin". Voiced by Ed Begley Jr. Mr. Ruhle The principal of Walkerville Elementary. In "Makes a Rainbow", he once ran a bet with Ms. Frizzle on whether or not she could beat the light pinball machine she and Liz had built. He is an expert on chickens, owning a Rhode Island Red rooster named Giblets, whom Dorothy Ann had accidentally lost in "Cracks a Yolk". Voiced by Paul Winfield. In Rides Again, Season 2 Episode 13, He is revealed to be an expert on the Sun. In Rides Again, he is voiced by Martin Roach. Archibald Seedplot Phoebe's teacher at her old school who appears in "Goes To Seed." His passion seems to be gardening. It is learned in this episode that he knew Ms. Frizzle (and considers himself her "biggest fan"). Voiced by Robby Benson. Production Supervisors (aka The Magic School Bus Producers) In the fictional call-in segment at the end of the show, various characters answer questions asked by