The Magic School Bus: The Butterfly and the Bogbeast. First broadcast 7th October 1995, season 2 episode 5. The class needs a new mascot for their soccer team. Everyone laughs at Phoebe when she suggests using a butterfly, and Arnold's know-it-all cousin, Janet, suggests the mysterious Bog Beast instead. Ms. Frizzle takes them on a field trip to Butterfly Bog where they discover camouflage and other butterfly tricks of deception - learning just how clear and unwhimpy butterflies can be - while unmasking the mysterious Bog Beast!